I forgot my Apple ID and password, how can I restore it?

The Apple ID is information only you would know, so if you can't figure out the email address you used, then your only option is to provide the original purchase receipt from Apple or Authorized Apple seller to have the Activation Lock removed. A third party receipt will not be accepted. With that information, start a Support Request to remove the lock using this page.

How to remove Activation Lock - Apple Support

Try the iforgot site https://iforgot.apple.com/password/verify/appleid