The problem with ditching services like Discord or Google Docs or Dropbox isn't me, I'm happy to do it. It's everyones I need to work with. They aren't going to join my self-hosted service just to exchange work files or chat, etc. I've tried.

@grumpygamer I've been thinking for a while that I should host a Jabber server as soon as I can find anyone who wants to chat on Jabber.

(It hasn't come up so far. Shockingly.)

@ids1024 I did set one up for my family way back when, we're now using that for all our family comms. Also setup NextCloud with a calendar shared across all family members. The last one was kind of a killer feature that got everyone around.
If you want to start with Jabber, but not make an account, Quicksy is a super-simple start for everyone.