There is also Peersuite which is a P2P solution and offers great audio and streaming quality. However, it is mainly a single developer behind it and it hasn’t received an update in months. It still lacks some polish and features like a server instance and persistent chats and rooms.

For me, this is the most promising one I have come across in terms of a replacement for Discord.

Bazzite is absolutely great, if you just want a very reliable system that just works and goes out of your way. I lean nowadays way more into recommending Bazzite to new Linux users, since there is literally not much to initially set up, no matter the hardware. Gaming works perfectly fine and any regular users software needs get easily satisfied by the Bazaar.