Do you need/like matrix so much that you want to self-host it in place of more admin-friendly alternatives? The client/user side of matrix is okayish, but everything else is terrible. The protocol is inefficient by design and that’s not something faster languages will solve so expect your available resources to sink, all implementations suck in different ways, are highly incompatible, constantly changing and have you in a permanent stressful state of chasing the latest/breaking/testing stuff. The team in charge is in denial about a great many things, and lacks the deeply needed amount of focus and reality check to get things done (which I imagine has been a large contributor to more and more “institutional actors” dropping them recently, like France several months ago).

I could go on and on, but in short, I was at your place some time ago and the mess, disappointment and overall stress I found with matrix only compelled me to give XMPP a close look. Now I (and my users) are super happy with ejabberd and modern clients like Conversation/dino/movim make the while thing a very pleasant experience. Not all features of matrix are there, but I take reliability/predictability and simplicity over them any single day.