Forgot user id
I can’t login to my iPad mini because I forgot my user id
iPad Mini 5, iPadOS 13
Question marked as
If you forgot your Apple ID - https://support.apple.com/HT201354
"You’ve come to the right place to reset a forgotten password, unlock your account, or recover an Apple ID."
What to do after [or before] you change your Apple ID email address or password - https://support.apple.com/HT204071
If you still need help:
Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."