Idk why, and it just suddenly started today, but no matter what project i try to open in unity, it says "unable to join player connection to multicast group", and if there was anything in the project (not files, only scenes and stuff in them) it would revert back to the sample scene with the only the main camera and in 3d with the directional light, and its not just on projects i import, but also on projects that i worked on previously and opened them before this started. I tried looking it up on google and found nothing that could help me, anyone know how I can fix this?

I think Unity Hub specifically is the root of a lot of those issues. Uninstall the Hub and see if you can open your Unity version.exe. without hub, it should ask you to open a project from disk. You should be able to reinstall Hub fine afterwards. Re-activating license key might also do the trick.