That's why other commenters say they get their traffic from r/programming or HN. You are a blog in a sea of blogs and other crap.
Of course you can still post about something you learned and bring some new traffic, because you explain it in an accessible way. Or you may write about something on a company blog. But if your aim is to create new, unique tech content, the chances are there's already another blog post, 2 SO answers, and a few relevant mailing list posts on the topic. We're constantly accumulating tech knowledge and mostly we're running into the same problems.