Yeah, the problem is that a lot of those are effectively dead, subsumed by Reddit and Facebook.
I've sometimes dug up still existing sites from the 2000s I used to visit, and the results are typically depressing. Such as:
* Site still exists, but is terribly broken. Doesn't render, uses now incompatible SSL, or something. It's a forgotten server in somebody's closet, still chugging, but not being maintained, so whatever remains will probably vanish whenever the disk/PSU/etc fails.
* Last posts from 2015, mostly with "gee, it's kind of dead in here, anyone still around?" comments at the end of threads.
* Discussion is down to 5 people that post once a month, and there's also a thread with obituaries for past well known members.
Some forums are still alive, although not with the vigor that they had twenty years ago (talkbass.com is one that springs to mind).
I maintain a blog, but I doubt I have many readers (or any). I made a deliberate choice to not put any sort of analytics on the site so that I won’t be tempted to obsess about whether anyone actually visits. Some of the individual blogs that I know don’t get much readership that I read via RSS, I make a point of commenting on the rare posts to encourage the authors to write more. It doesn’t seem to make much difference although I’m sure they appreciate the positive feedback.
A lot of the delightful weirdness is gone. All the tilde sites with hand-made HTML and lots of flashing gifs and blink tags may have been tacky, but they were fun. I don’t get the kind of pleasure from most websites that I did back in the days of worst of the net which often surfaced delightful strange things that were completely unfiltered.
the handful of sites you feel like you're stuck using for some reason
Billions have been spent building walls around niche and small sites to funnel people into major platforms. Pretending this ad/discoverability infrastructure doesn't exist is very naive.