Whether or not XMPP is a Signal or a Discord replacement is dependant on the client.

For a Discord replacement, there is the Movim XMPP client, which has group audio/video calls, screensharing (w/audio using chromium based browser), support for gifs and videos within the chat, and very soon Discord-like servers with rooms, after which the dev plans to work on drop-in voice chat rooms.

I tried a lot, I think it has the most feature parity.

Have you tried Movim? It has most of the essential features, like group video calls, screen sharing, and a better E2EE method than matrix (IMO, anyway). It’s also much easier to set up and host since it uses XMPP.