There are three ways by which users can easily Apple ID Support. These credentials are filled by users at the time of signing up.
 By answering the security question
 To get an email in your rescue email address
 Or through Recover key by using two-factor authentication or two steps verification
If you are not able to Reset Apple ID by following these steps then communicate with tech support engineers who will guide you with the complete process.
Read More:- Lost Apple id