What mac do you have? Some of those are not supported.
VoDoAir2013
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Do you have any kext extensions installed? I just upgraded Catalina to Big Sur, I have Arch linux on the same disk and have external disk with Catalina, everything works ok, I use refind for booting. Try to reset PRAM and other stuff. Only problem is when boot to ext Catalina it screams that it does not recognise some disk, I guess it is new Big Sur installation because it did not do before. Anyway it works ok on my old Air 2013.
Or you can open Bootcamp it will free up space.
Yesterday, check your email.
I think yes. I disabled iCloud sync on Catalina and allowed only Safari to sync, just in case. Then I upgraded. I now use iCloud on web.
I login to Music and no problem there.