The fascist noose is tightening the world over thanks to proprietary big tech. We have to escape now while we can to open-source alternatives.
Currently the best self-hostable, private (encrypted) and federated communication platform is XMPP/Jabber, which I recommend switching to as soon as possible.
Armed with an XMPP account, you will be able to log into any open Movim instance, which is an XMPP client that offers 90% of the features of Discord, including group video calls, group texts, and even screensharing with audio (must use a Chromium based browser currently to share the audio). The only feature missing is discord-style rooms, which the dev is currently working on to release as fast as possible.
For a more complete guide to swapping proprietary apps for safe open-source ones, I suggest referring to this post: https://lemmy.cafe/post/18663514