What are the best Matrix servers for chatting?

I am aspiring to one day host a chat server of some kind to eventually replace my Discord server. Matrix has caught my eye and I'm looking to try using it a bit to get a feel for it, but I can't seem to find any communities that i really like. There's a lot of niche stuff out there and it's hard for me to find servers that have rooms with content I'm interested in, like general chatting or gaming. Does anybody have any suggestions?

(I am also open to any similar suggestions you have for other similar apps like Revolt)