I have always believed in good quality content, well structured and written in a way that isn’t just about promotional talk. Thanks for sharing this information with us, it’s always helpful to have everything written in a concise manner so we can remind ourselves now and again of what it takes to increase organic traffic. As an SEO consultant myself I come across websites all the time that are messy and still using tactics that have long been out of date. Having a successful website is all about quality content and links. I like it that you stated what the problem was and then how you fixed it for the client. Great article.
Brankica, Very comprehensive list there. Can't think of anything else :D RT! I think the traffic sources that I hardly use is answering questions. I find that traffic conversion there is poor for me, so I don't focus too much on it. I think of all those in the list, focus on those that gives you the best kind of traffic. Forums can be a particularly useful one especially when people are there asking for help. Answering their questions and giving them a link that benefits their query is one good way of getting the right kind of traffic.
The first step that I take is to do a quick Google search to find pages on my domain where I've mentioned the keyword in question so that I can add an internal link. To do this, I'll use the following search query, replacing DOMAIN with your domain name (e.g. matthewbarby.com) and KEYWORD with the keyword you're targeting (e.g. "social media strategy"):

Incidentally, according to a June 2013 study by Chitika, 9 out of 10 searchers don't go beyond Google's first page of organic search results, a claim often cited by the search engine optimization (SEO) industry to justify optimizing websites for organic search. Organic SEO describes the use of certain strategies or tools to elevate a website's content in the "free" search results.
Visitors can also fall into the direct category by clicking a link to your site from an email or PDF document, accessing your site from a shortened URL (which is an abbreviated version of your website address), clicking on a link from a secured site to your non-secure site, or clicking on a link to your site from a social media application like Facebook or Twitter. And, there is a chance that accessing your site from an organic search can end up being reported as direct traffic.
Mobile traffic: In the Groupon experiment mentioned above, Groupon found that both browser and device matter in web analytics’ ability to track organic traffic. Although desktops using common browsers saw a smaller impact from the test (10-20 percent), mobile devices saw a 50 percent drop in direct traffic when the site was de-indexed. In short, as mobile users grow, we are likely to see direct traffic rise even more from organic search traffic.