Wow Brian, You have solved my problem. A few days back I was looking for ways to increase traffic on my tech blog, I found this blog post by you while I was looking out for possible tricks to increase traffic. I must say that few of the tricks mentioned above really worked for me. For example, I updated a few old posts on my blog, I did try the broken link building technique and the last I did was to repost my content on Medium.
Google Analytics is an invaluable source of data on just about every conceivable aspect of your site, from your most popular pages to visitor demographics. Keep a close eye on your Analytics data, and use this information to inform your promotional and content strategies. Pay attention to what posts and pages are proving the most popular. Inspect visitor data to see how, where and when your site traffic is coming from.
If you havent see it already, check out the links in shor's comment below - there are some great resources in there. In some cases you can also consider surveying your current audience or customers through email, on-site surveys or SurveyMonkey. Be sure to ask for some profiling information that you can use for determining specific persona needs like age, sex, location, etc. (Probably best not to make it sound like a creepy text chat like I just did though...) :)