My iPhone can’t download in App Store again
Why my iPhone can’t sign into Appel Id
iPhone 6, iOS 12
Question marked as
Perhaps this may help: https://support.apple.com/en-us/HT208856
If you are locked out of your Apple ID account you can go to https://iforgot.apple.com
This will provide you with the recovery steps you put in place for this situation.
Here are some support articles that should help:
If you forgot your Apple ID password - Apple Support
If you forgot the answers to your Apple ID security questions - Apple Support
If your Apple ID has been locked or disabled – Apple Support