What internet discussion sites remain?

I'm using the phrase 'internet discussion site' pretty informally, so I hope my meaning will become clearer as you continue reading.

I got rid of Snapchat around 4 years ago now. At some point in 2023 I noticed a sharp downtick in discussion quality on Twitter, and got rid of it as well. About two years ago, frustrated with the lack of human interaction and the vying for attention, I deleted Instagram. Near the end of 2025, I stopped using Discord. The final nail in the coffin has now arrived, since I'm unfortunately coming to the conclusion that Reddit is no longer worth visiting, leaving me almost entirely cordoned off from internet communication at a time when more humans are using it than ever before.
I won't bother repeating my personal reasons for this exodus since I feel confident that most people on this website have feelings on the matter that at least approximate my own.
Realistically this is a sign that it's time to prioritize interaction in the real world, and that's certainly a worthwhile thing to pursue. But bluntly society has restructured around the internet in a pretty substantial way, and I don't think it's an unreasonable ask to find various forms of forums on which more meaningful discussions can take place.
Here is my personal survey of the current landscape:

• tildes.net: Basically good. I really enjoy this website and I think in a lot of ways the 'bar/pub/cafe' model for a forum, where you can peer through the window but require permission to gain admission, is the only viable model for future online discussion places as the internet becomes ever more saturated with bots and bad actors.
• lobste.rs: Also basically good, for the same reasons as tildes. In some aspects, limited by the fact that it has a particular focus. In other ways, that's a really good thing. Maybe in a perfect world there would be a lobste.rs equivalent for every hobby, and we would return to an early internet forum world.
• Hacker News: Also basically good but perhaps a bit less so than the above two. I think most of the things posted on there are interesting, but a lot of the discussion has lately felt less insightful than it used to. I think a different tildes post noted this as well, but it's very caught up in the AI news cycle, often to an unfortunate degree.
• Rateyourmusic: The core site is enjoyable, and the forums are usually fun to check in on every now and then. Certainly a worthwhile place to visit if you enjoy music.
• Stackexchange networks: This is cheating since this is obviously many sites. I'm a mathematics student and I've found MSE and MathOverflow to be really wonderful places to learn and converse, albeit with some very arcane and strict rules for posting. The philosophy SE seems also generally of a high quality, and there are many other SE sites that I occasionally stumble into and am pleasantly surprised by. Unfortunately I expect its time is finite, since the UX has slowly but surely been degrading and the site traffic dropping.
• Fediverse networks: These sites clearly have potential, but for whatever reason it's still just not there. I drop into lemmy and Mastodon occasionally, but the posts are rarely of high quality. In many ways they just feel like "Reddit/Twitter but with a different name".

Surely these can't be all, right? It's a little soul-crushing to think how many people are online at any given time and how hard it is to find a place not drowning in noise. Maybe this is just my lament.