You could get even more specific by narrowing it down to customer base. Is there a specific group of clients you tend to serve? Try including that in your long-tail key phrase. For example: “SEO agency for non-profits in Albuquerque NM.” That’s a key phrase you’re a lot more likely to rank for. Not to mention it will also attract way more targeted, organic traffic than a broad key phrase like “SEO agency.”

One of the reasons for a traffic drop can also be due to your site losing links. You may be seeing a direct loss of that referral traffic, but there could also be indirect effects. When your site loses inbound links, it tells Google that your site isn't as authoritative anymore, which leads to lower search rankings that in turn lead to traffic drops (because fewer people are finding your site if it's not ranked as highly and more).

Users land on this page without tracking code. They click on a link to a deeper page which does have tracking code. From GA’s perspective, the first hit of the session is the second page visited, meaning that the referrer appears as your own website (i.e. a self-referral). If your domain is on the referral exclusion list (as per default configuration), the session is bucketed as direct. This will happen even if the first URL is tagged with UTM campaign parameters.
Thank you Jayne, for doing all that voting and sharing, means the world to me! I am glad you saw some new ideas and looking at all the comments, I think I killed a really bug tree with this post, that is how many people want to print it out, lol. If at any point of time you get stuck with one of these, send me an e-mail, tweet, what ever and I will try to help you with extra ideas :)
The good news is, however, indications are that dark social should decrease more and more over time, as social media as a sharing mechanism -- as opposed to email -- only continues to grow. In fact, in the same article we mentioned earlier, BuzzFeed cited a preference with millennials to share over Facebook and Twitter, alongside a longer term downward trend of sharing over email. 

Regarding Link Detox, links it diagnoses as Toxic are generally fine as they're either not indexed by Google or have malware/viruses/etc., but I recommend a manual review of any diagnosed as Suspicious. I used it recently to get started cleaning up our backlinks and some legit sites and blogs were under Suspicious simply because they didn't have many links pointing to them.
Traffic coming from SEO (Search Engine Optimization) is free, while traffic generated from PPC (Pay Per Click) ads is not free. PPC ads are displayed above organic search results or on the sidebar of search engine pages for search queries related to their topic. Landing page keywords, ad keywords, CPC (cost per click) bids, and targeting all influence how those ads are “served” or displayed on the page.
Make a campaign on microworkers about "Post my Link On Relevant Forums". Currently Micoworkers has about 850.000 freelance workers worldwide. You know that posting a link on Forums is not that easy. There would be thousands workers out of your campaign after they're trying hard the get a forum that accepts a link within their post. But the benefit for you is that they have visited your link to understand your site to search a relevant forum for your link. On this campaign you only accept real clickable link on forums. From about 850.000 there will be ten to hundred thousands freelancers who are interested to work on your campaign "if " you make a long lasting campaign(s) by hiring at least 200 posisions and teasing among 850.000 workers by paying $0.30 - $0.50 once one successfully posted your link on a relevant forum.
This topic seems actually quite controversial. Google answered the question by what could be taken as a denial. But their answer was kind of open to interpretations. And on the other hand, there are studies (one of them from Moz) that showed linking out has an impact. So, how can you be so assertive? Is it something that comes out from your own experiments?
Direct traffic can encompass a wide range of sources, including those you would have liked to have tracked in analytics. A drop in traffic from a particular source does not necessarily mean a drop in traffic. It could indicate a case in which that source ended up being categorized under Direct traffic. The best advice is - proactively use tracking parameters in cases where you may be risking not properly seeing traffic. There is actually a nice infographic showing the main factors impacting traffic. I use it sometimes to solve the current issues. Taking the right steps to address potentially miscategorized traffic, as well as being upfront with clients about the causes, can help to mitigate problems.
Lol, yeah, I am so happy its published cause it is awesome to be a part of this contest you guys are doing. I just know I will meet some great people. You should check out Website Babble, it is related to blogging and a great related traffic source. By the way, the post was pretty long so I didn't want to stuff it with more details, but a lot of the mentioned answer sites have your links set to do-follow :) Thanks so much for the comment! Um beijo.
Another point which you did mention (between the lines: "and updating your backlinks to point to HTTPS URLs") but I actually didn't realize enough is that updating backlinks when your site switches from http to https is very important. Redirecting all http traffic to the https version of your site from the server (301) is necessary, but doesn't solve losing referral data. Only updating backlinks, especially those on httpS-sites, does. I'd like to emphasize that!

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.

You had to know social media would be on the list. I generally recommend that a site only have a presence on 2-3 social networks, at least while they’re small. It’s a lot of work to maintain, engage, and update a social network profile, and keep its messaging consistent with your branding. You can always spay someone to do it for you, but then it’s not a free traffic source, is it?

11th point to me would be too look at your social media properties, work out how you can use them to assist your SEO strategy. I mean working on competitions via social channels to drive SEO benefit to your main site is great, working on re-doing your YouTube videos to assist the main site and also working on your content sharing strategy via these social sites back to the main site.

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.