Is there a way to change the email address of an Apple ID??

You will first have to recover the AppleID from locked - start here - If your Apple ID is locked or disabled - Apple Support

You can always change the primary email (or backup email or any other information associated with your AppleID) used for your AppleID by logging into the AppleID management portal - https://appleid.apple.com/

Note the restrictions in the article.

Apple ID Name Change

 What to do after you change your Apple ID or password - Apple Support     I suggest doing this before you change your Apple ID or password.