Catalina update ruined my MacBook Pro (15 inch mid 2015)

Among numerous other problems, including, but not limited to Safari not work and my e-mail having major issues, I can no longer upload files to the icloud. Every file I have created or worked on since the Catalina update is on my computer, but will not upload to icloud. Great, thanks Apple. I transitioned to apple 7 years ago from PC's for the same problems I know have with Apple. What happened and what's the fix? PC's had a simple System Restore answer, Apple has no answer, maybe someone here does.

Thank you.