Mac Keychain problems after deleting .AppleSetupDone
As @Tetsujin pointed out your question a a wall of text and is difficult to read.

Although you reset your user password/created a new one the Keychain is encrypted using the old password.

Take a look a the following articles, they should solve your problem.


Reset Keychain Password
If you keep getting prompted to enter your keychain password


Also take a look at this AskDifferent answer describing some possible fixes.

How do I delete or fix my Keychain after changing my password?

If none of these work, please edit your question to clarify your issue.