Cannot sign in to iCloud with the same password on Ventura after reverting from Monterey

Mac computer password entered correctly but denied on Monterey while signing in to icloud, reverted to Ventura and signed in successfully after download with same password refused while in Monterey. Now, same password is refused in sign in to icloud

MBP 2.8ghz 15" 16gb ram Can't sign in to icloud using the same password used for years. Problem began after downloading Monterey, reverted to Ventura and signed in with old password. but now on ventura can't use this password to sign into icloud. How to reset password please?

[Re-Titled by Moderator]