I'm writing here today to share my experience with you. I have a website with more than 600 unique and useful articles and I was getting no to little organic traffic for years till I found an http://www.zakshow.com/internal-linking-as-a-long-term-seo-strategy/. So I started all over again and created a schema of all my content and I categorized it. Then I started to update my oldest posts by following a strict interlinking strategy. After doing that I started seeing some improvement in serps in addition of an improvement of the overall visitors experience in the siteweb without getting any external links. Did anyone experiencing the same thing? Or it's just a coincidence?