It definitely goes through waves, my posting habits included. I don't know how transferrable my experience is either, but most of my mutuals I met via shared hobbies, particularly Magic (when I played a lot more Magic…). I follow people who talk about stuff I care about.

A lot of my friends are also in the tech field either either professionally or as hobbyists, but I usually stay away from "tech Twitter". I get enough work at work. I don't tend to follow big names, I don't follow anyone shilling for crypto, and I'm pretty liberal with the block button.

(I also use Tweetdeck, and an app called Talon on my phone, not the main Twitter site or app, so I get things in chronological order with a minimum of nonsense.)