There has definitely been a renaissance of old school forums since social media started to decline. One advantage to them ia that to bother registering and tracking a separate website for one topic, you'd have to be pretty interested in that topic. So the tiny barrier to entry seems like it promotes deeper discussion and higher quality responses.

Simultaneously, some really cool new forum software has become available with useful and elegant features that the old forums didn't have, but without the attention traps and monetization of the corporate web.

If you have a hobby, look for a forum; you might be surprised at how may have sprung up.