There’s Matrix, XMPP, Delta Chat and IRC. IRC is oldschool and popular, you have channels like on Discord but you can only send text. If you want we can message together or create some group chat. I also looking for people to chat outside Discord. My matrix is @ml0dy:noevil.pl, XMPP mlody@hakier.pl and IRC #zimno on Libera Chat.

I tried Ardour but it’s UI is terrible and ugly for me. I miss that perfect piano roll from FL Studio… Of course Ardour have great reviews.

Yes, but I heard bad opions about it in the past, don’t remember where. Are you using it?