How to discontinue iCloud
How can I discontinue my iCloud service and restore everything to my computer, but keep my Apple ID?
MacBook Air 13″, macOS 10.15
Archive the iCloud data https://support.apple.com/en-us/HT204055
And turn off iCloud features for the applications box ( don't turn off the box of specially keychain it will create pop ups on Mac and might be corrupted ) , also keep safari box also turned as on .
The Apple ID is yet signed in Mac system preferences .