We are in the SEO industry for a while now, wearing many hats: digital marketers, tool developers, advisers, researchers, copywriters, etc. But first of all, we are, just like you, site owners. And we’ve been through ups and downs regarding organic traffic, and we were in the situation of trying to understand why the Google traffic dropped dramatically at some point as well. Having all these in mind, we’ve thought of easing your work, and we’ve put together a list with the top 16 reasons that can cause sudden traffic drop, unrelated to Google algorithm changes or penalties.
Let’s say that you want to move your blog from a subdirectory URL (yourwebsiterulz.com/blog) to a subdomain (blog.yourwebsiterulz.com). Although Matt Cutts, former Google engineer, said that “they are roughly equivalent and you should basically go with whichever one is easier for you in terms of configuration, your CMSs, all that sort of stuff”, it seems that things are a bit more complicated than that. 
It’s content like this that forms the foundation of effective content marketing: a crucial component in modern day integrated marketing campaigns that cohesively drive marketing results. It’s so vital, in fact, that some 22% of those surveyed at Smart Insights said that content marketing would be the digital marketing activity with the greatest commercial impact in 2016.
So we’re confident that the high social traffic in the sixth example above reflects the highly successful social media campaigns the organization is working on. We could also see this pattern for a site which has decided that they can’t succeed with search and has, as Google suggests for such websites, chosen to work on social media success instead. The difference is, one site would have good Search and Direct traffic and really good social media, while the other might have dismal Search and rely heavily on social media, which is very time consuming and often has a low ROI. This second pattern is one we’ve seen with microbusinesses where the business owner is spending hours each day on social media and making very little progress in the business. Making the investment in a better website would probably pay off better in the long run, even if it seems like an expensive choice.
At our agency, we work with sites of varying sizes, from very large to quite small, and recently, we have noticed a trend at the enterprise level. These sites aren’t relying as much on Google for traffic any more. Not only are they not relying on Google traffic, but also, the sites are getting less than 10 percent (or slightly more) of their organic traffic from the search giant.
What does that mean for your website? Organic Traffic is any of the customers that come to your website without clicking a link on another site (referral traffic) or clicking an ad (paid traffic) – these visitors used a known search engine and clicked a link to view your website. Much of this traffic is customers from Google, but it also includes other common search engines like Bing and Yahoo. Now that we know what it is, let’s dive into understanding how this information can help you improve your website.
This was an extremely comprehensive, well-thought out list Brankica! I would never have thought of eBay or Craigslist- so I thought your spin on that is interesting. I would definitely recommend this list to any newbie blogger. :) So it took me awhile to come up with a #51 just because you seemed to cover everything-lo. It's an angle on the answering questions- volunteer to be interviewed on your niche for other bloggers or on a site like HARO. If you provide some great value, it is the next logical step for something to visit your site to learn more about you. Great work!!
Hey Patricia, glad you liked the post and found more things to do... Like you are not overwhelmed with stuff lately anyway, lol. Please, don't try all at once. One traffic source every few days. For two reasons: not to get overwhelmed and to be able to track some results. I think if a blogger would master only 3 to 5 of these sources, it would bring incredible amounts of traffic. By master I mean just that - be a master, not just do it in some spare time ;)
Plan your link structure. Start with the main navigation and decide how to best connect pages both physically (URL structure) and virtually (internal links) to clearly establish your content themes. Try to include at least 3-5 quality subpages under each core silo landing page. Link internally between the subpages. Link each subpage back up to the main silo landing page.
WOW Brankica, cannot believe that you also includes Craigslist.org on your list! What a great post, indeed. ;) Elise add #51 email list building, so I would add #52 rss feed submission, #53 review websites like resellerratings.com, reviewcentre.com, etc., #54 blog search engine like Technorati, plus I have about 40 video websites where you can upload and share your video like break.com, blip.tv. Good luck with the contest. ;)

Amy Gesenhues is Third Door Media's General Assignment Reporter, covering the latest news and updates for Search Engine Land and Marketing Land. From 2009 to 2012, she was an award-winning syndicated columnist for a number of daily newspapers from New York to Texas. With more than ten years of marketing management experience, she has contributed to a variety of traditional and online publications, including MarketingProfs.com, SoftwareCEO.com, and Sales and Marketing Management Magazine. Read more of Amy's articles.
Have you conisidered traffic exchanges, or blog exchanges. After submitting your URL and signing up to about 10 exchanges, it takes about an hour clicking through all 10 surf sights at a time. But it does give you some good traffic. I reciently started doing it and I am now getting around 200 visitors a day. That is just from traffic exchanges. not bad from just one type of traffic source
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It's a little awkward, so we'll get straight to the point: This Monday we humbly ask you to defend Wikipedia's independence. We depend on donations averaging about $16.36, but 99% of our readers don't give. If everyone reading this gave $3, we could keep Wikipedia thriving for years to come. The price of your Monday coffee is all we need. When we made Wikipedia a non-profit, people warned us we'd regret it. But if Wikipedia became commercial, it would be a great loss to the world. Wikipedia is a place to learn, not a place for advertising. It unites all of us who love knowledge: contributors, readers and the donors who keep us thriving. The heart and soul of Wikipedia is a community of people working to bring you unlimited access to reliable, neutral information. Please take a minute to help us keep Wikipedia growing. Thank you.
This traffic source comes from search engines like Google, Bing, and Yahoo. Remember, paid search ads or PPC (pay-per-click) advertising are not included within this source category. If you choose to run a paid advertising campaign for your business, it will not affect your website’s ranking within an organic search. Organic search is obtained through natural placement on search engine results, without paying for it, through search engine optimization best practices.
For reasons we’ve already discussed, traffic from bookmarks and dark social is an enormously valuable segment to analyze. These are likely to be some of your most loyal and engaged users, and it’s not uncommon to see a notably higher conversion rate for a clean direct channel compared to the site average. You should make the effort to get to know them.
As I mentioned earlier, one of the biggest downsides to SEO is that Google is constantly making changes to their algorithm; they come out of nowhere, and they can drop your domain authority by 5, 10, even 15 points and it almost feels like you need to start optimizing all over again. It's frustrating, it's hard work and the results aren't always visible - but if you can get SEO right, it can truly be an amazing source of traffic.
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Brankica, aloha. Yet another great article. With the in-depth info and resources you have been giving us, I don't know how you have time for anything else. This is another one that will live on my computer. You mention several words/places that I have not seen before. Look forward to exploring. Off to tweet. Will be working on a 51 for you. Take good care, my friend. Aloha. Janet
Let’s say you wish to block all URLs that have the PDF. extension. If you write in your robots.txt a line that looks like this: User-agent: Googlebot Disallow: /*.pdf$. The sign “$” from the end basically tells bots that only URLs ending in PDF shouldn’t be crawled while any other URL containing “PDF” should be. I know it might sound complicated, yet the moral of this story is that a simple misused symbol can break your marketing strategy along with your organic traffic. Below you can find a list with the correct robotx.txt wildcard matches and, as long as you keep count of it, you should be on the safe side of website’s traffic.
If you want to drop from your hard worked #14 position to #79, you can start looking for companies that advertise themselves like the one in the image below. We don’t even know what to believe when it comes to companies that promise guaranteed instant traffic: that they are folly (in which case you don’t need them) or charlatans (in which case you don’t want them). If you want to find out more about SEO agencies and how they can ruin your website’s traffic, we wrote a previous blog post on this. 
To sum up all of this information, even organic traffic, like direct traffic, has some gray areas. For the most part, though, organic traffic is driven by SEO. The better you are ranking for competitive keywords, the more organic traffic will result. Websites that consistently create content optimized for search will see a steady increase in organic search traffic and improved positioning in the search results. As a marketer, it is important to look at your keywords and high-ranking pages to identify new SEO opportunities each month.