@MangoMamba thanks for asking me! Here's my recommendation today for #Xmpp:
- #Movim https://movim.eu <- try this first!
- #Blabber https://blabber.im/en
- #Librehost https://libreho.st
- #Framasoft https://entraide.chatons.org/en
I suggest you to ask my friend @lps for further Xmpp things.