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I've found that they're especially useful, when integrated with Rocket.Chat https://rocket.chat/ which you can also self host https://github.com/RocketChat
That way you have an experience that's a lot like Slack/Teams, with pretty good support for chat, reactions, file uploads, discussions, making quotes etc., while also being able to start video/audio calls with the press of a single button.
Of course, if that's too many platforms, Rocket.Chat also supports WebRTC, albeit the UX was a bit less stellar when i last tried it. Regardless, those are some very competent options which allow all the data to remain on your own servers.
Yes, there are many self-hosted options out there. https://github.com/meetecho/janus-gateway works well for multi-party video with up to about 15 users in a room assuming everyone has a reasonably reliable connection.
Galène[1], which is FLOSS, was specifically developed by the University of Paris for the purpose you're describing.
The UI is terrible, I'll admit that, but the performance and scalability is better than Zoom.
[1] https://galene.org/