Hey caramelcode, I recently learned that there's a very nice Matrix <--> Discord bridge available. Set-up is a bit tedious (you must create a Matrix room for every Discord channel and bridge them individually) but it's simple and it works: https://t2bot.io/discord/
Next year it'd be great to have a bridge to enable a fully FOSS way to chat. I would be happy to set up the Matrix end.
Thanks!