Matrix? That’s the open source and federated equivalent to discord. And it’s end-to-end encrypted.
Matrix is very good and flexible. If you need something that is interface-compatible with Discord, there is: https://revolt.chat/
Don’t they say that they also collect some amount of data in their Google Play page? Asking just because it’s said that the problem with Discord is about privacy…
Just the small data for troubleshooting and some phone model metrics (e.g. your Android version). Nothing any suspicious
Matrix is the usual suggestion. I’ve never used voice chat on it or the clients for it like Element though so I can’t speak to how well it works if you need that function in Discord.
You answer is Matrix, it has a learning curve but is robust.