Why would you go to work if you know you are not feeling well??

Can’t say which’s the best but you can try one of this: https://getsession.org/ http://wiremin.org/ https://matrix.org/

Ditch Twitter (sorry, X), Meta, Threads. Also stop using Google if you can.

It’s not open source, indeed. But I noticed that the users on WireMin are all very concerned about protecting their privacy. For example there’s one community created by one anonymous user: The Gray Papers- Take back your data. https://i.wiremin.com/invite/?g=k48934787653