Hey, Matt! Thank you for your sharing, and I learned much from it, but I still have a question. We began to do SEO work for our site 2 years ago, and our organic traffic grew 5 times ( from 8K to 40K every day). But two years later, it is very difficult to get it grow more, even it drop to 3.2K every day. So can you give me any advice to make our site's traffic grow again? Thank you in advance!
SEO is not an appropriate strategy for every website, and other Internet marketing strategies can be more effective like paid advertising through pay per click (PPC) campaigns, depending on the site operator's goals. Search engine marketing (SEM), is practice of designing, running, and optimizing search engine ad campaigns.[55] Its difference from SEO is most simply depicted as the difference between paid and unpaid priority ranking in search results. Its purpose regards prominence more so than relevance; website developers should regard SEM with the utmost importance with consideration to PageRank visibility as most navigate to the primary listings of their search.[56] A successful Internet marketing campaign may also depend upon building high quality web pages to engage and persuade, setting up analytics programs to enable site owners to measure results, and improving a site's conversion rate.[57] In November 2015, Google released a full 160 page version of its Search Quality Rating Guidelines to the public,[58] which now shows a shift in their focus towards "usefulness" and mobile search. In recent years the mobile market has exploded, overtaking the use of desktops as shown in by StatCounter in October 2016 where they analysed 2.5 million websites and 51.3% of the pages were loaded by a mobile device [59]. Google has been one of the companies that have utilised the popularity of mobile usage by encouraging websites to use their Google Search Console, the Mobile-Friendly Test, which allows companies to measure up their website to the search engine results and how user-friendly it is.
As you can see by the example above, organic marketing tactics are natural, authentic, and value-based. The benefits that businesses reap from these tactics are cultivated over longer periods of time, ultimately helping you build a brand that customers want to visit regularly. And although you’re doing less “pushing” with organic marketing, when done right you can still generate a steady stream of loyal traffic. Remember, this is about building high-value brand equity and industry authority with your customers. You’re not just attempting to drive sales here; you’re working hard to engage and educate your target audiences.  
One important thing to note is a website’s domain authority (DA) and page authority (PA). This is a number from 1 to 100 that indicates the strength of a website’s domain or a specific page. DA and PA are two of several factors that go into how a website will be ranked on a SERP. The higher the DA and PA, the better the chances are of that webpage ranking on the front page of a SERP (everyone’s dream!). This number is determined by a few things, such as the age of the website and number of links leading to it (backlinks).
Step #3: Calculate your ROI based on the right performance indicators The performance indicators will depend on the objective you selected in the first step. Want to generate leads? You could track your new subscribers. Want to increase engagement? You could track clicks, comments, shares, etc. Let’s go with the first example: Your goal is customer acquisition. You’ve already set up tracking for sales conversions. It’s time to dissect your organic search traffic.
Using this data can help you identify additional “buyer” keywords to target and what keywords to stop targeting. Keyword research, content marketing, and link building are things that you need to constantly be doing, even when you reach the top of the search rankings. Many businesses think that they can slow down these efforts once they reach the top, but easing up on your SEO strategy will see your competition take over the top position if you are not continually improving your search engine optimization effort.
Search engine marketing, or SEM, is one of the most effective ways to grow your business in an increasingly competitive marketplace. With millions of businesses out there all vying for the same eyeballs, it’s never been more important to advertise online, and search engine marketing is the most effective way to promote your products and grow your business.

Your site is GOOD! Well-written, informative, authentic. You live it; you write it. You are spot-on for what your "typical reader" needs/wants. That authenticity makes a difference. Yes, I've surfed around other low-carb diet sites, but I feel like they are just "spouting" at me. Your posts are written as if we're sisters or best friends and you're talking WITH me.
Well as noted in the post it is not just above the links that was only one key part of a wider strategy. This website in question has deep levels of content. So it is not just about a blog section, they have numerous high quality content sections we have developed over time. It would not be advisable ever to attack competitors sites with low quality links.
Organic is what people are looking for; the rest of these simply put things in front of people who may or may not be seeking what you offer. We know that approximately X number of people are looking for Y every day. So if we can get on front of those people, we have a much greater opportunity to create long-term relationships and increase our overall ROI.
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