When I was running things on Wordpress back in the day, I tried using categories, but with little consistency. Every new topic meant a new category, and a hierarchy developed that confused rather than clarified. Eventually tags became a thing, but by then I'd already developed a bad habit of posting without that helpful metadata.
Earlier this year I read an article about how folks find pages and navigate through websites, and while I'm not rebuilding my site, I do want to make it easier to click around and find related posts. So I've slooooooowly started digging through my archives updating posts with appropriate tags. It's a trip down memory lane at least, if a lot of insane work for a site with a small readership.