Hi, thanks for your comment. When you refer to incognito browsing, I think it's important to clarify that referrer data *is* passed between sites. Click on a link whilst in incognito, and the referrer header is passed as usual. The exception is if you're browsing normally, and then opt to open a specific link in incognito mode - this won't pass referrer data.
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.
If you’ve recently modified your on-page copy, undergone a site overhaul (removing pages, reordering the navigation) or migrated your site sans redirects, it’s reasonable to expect a decline in traffic. After reworking your site content, Google must re-crawl and then re-index these pages. It’s not uncommon to experience unstable rankings for up to a few weeks afterwards.
To give you an idea of just how much money is being spent on paid search, take a look at Google. Google's AdWords program is the most used pay-per-click (PPC) advertising program available today. While the tech giant owns YouTube and Android, among hundreds of other profitable brands, AdWords accounts for roughly 70% of their revenue -- which speaks wonders for its effectiveness.
Having large groups of content that all revolve around the same topic will build more relevance around keywords that you're trying to rank for within these topics, and it makes it much easier for Google to associate your content with specific topics. Not only that, but it makes it much easier to interlink between your content, pushing more internal links through your website.
Forum comments work much the same way as blog comments, except you tend to lack the base post from which to play off. Instead, you need to invest some time into getting to know the culture of the forum, the prominent users, the rules, and the discussion flow. If people generally post one sentence at a time, adding a 3,000 word post will be excessive and may be mocked. If people tend to post lengthy discussions, short posts may have a negative effect. And, like Reddit, some sites may be very rabid about enforcing no advertising.
Input your post’s url into SEMrush to discover the keywords that it’s already ranking for. Are you ranking just off the first page of the SERPs for any specific keywords that have a high search volume? Take a look at keywords which are ranking in positions 2-10 and try optimizing for these first — moving from third to first position for a term with high search volume can drastically increase organic traffic. Plus, it’s easier to bump a page up the SERPs when it’s already ranking for that keyword.