Apple ID Update // No secure connection
I have several problems, maybe they are all linked to each other. My Macbook air keeps telling me to update my Apple ID setting but nothing happens when I click on continue. I can't sign out and "find my Mac" can't be disabled. I changed my Apple ID password but can't sign in again, it just says "An unknown error has occurred". Then sometimes it says "This Mac can't connect to iCloud because of a problem with (Email address)". I also can't open Netflix, Google or any other page on Safari (I tried changing my DNS to 8.8.8., didn't help). And yes, I turned it off and back on again. Maybe I should try putting it in rice. Help would much appreciated!
MacBook Air 13″, macOS 10.15