Hello, did you already look for other rooms on All rooms - search.jabber.network ? What would be the common interest of the participants if it not for Yunohost support or technical exchanges around Yunohost ?
A lot of my life is Yunohost, of course, but not everything.
I’m not looking to discuss all my problems with forum members, but seeing many knowledgeable people with different backgrounds (in case of Yunohost more than regular F/OS projects, I think) I might discuss things only tangentially related to Yunohost, such as Free Culture, generic community meetups, or perhaps something banal as IT hardware advice, because you know and trust the forum members here better than any random forum.