Google re-targeting ads are a terrific way to get more traffic to your website. But not just any traffic. Re-targeting ads focus on people who've already visited your site and have left for whatever reason without completing a sale. This involves the usage of a conversion pixel for purchases and it's a great way to reach people who've already been to your site and aggressively market to them on Google's search engine shortly after they've left.
Historical refreshes of content is a good thing, especially if some of your content has expired. Note, this does not mean re-doing your content; simply refreshing it to bring it current if it isn't already evergreen content. Look at ways you can update outdated content on your site to drive more traffic through visibility on search engines like Google.
Like you I am a scientist and like you did in the past, I am currently working on translating great scientific literature into tips. In my case it’s child development research into play tips for parents. I can already see that the outcome of my experiment is going to be the same as yours. Great content but who cares. I hadn’t even thought about my key influences. I know some important ones, but don’t see how they would share my content. I thought I was writing content for my potential customers. Is your SEO that works course the same as the content that gets results course? Sorry if I sound a bit dim asking that question.
Do not be fooled by those traffic sellers promising thousands of hits an hour. What they really do is load up your URL in a program, along with a list of proxies. Then they run the program for a few hours. It looks like someone is on your site because your logs show visitors from thousands of different IPs. What happens in reality is your website is just pinged by the proxy, no one really sees your site. It is a waste of money.