I use Steam Chat for playing games with family and friends. It has better audio quality than discord in my opinion, and you can make groups (something like Discord servers) too. It doesn’t have all the functionality of servers, but the basic idea is there.
I am actually surprised nobody mentioned it yet Why use some third party application, when you can use the Steam’s one.
It’s not like the OP is concerned about privacy. They were using discord. They didn’t say it has to be open source.
For talking outside of gaming or away from PC, I use signal.
When are we finally moving to a percentage based fines?