Forgot my apple id and password for my apple watch
Forgot my apple id from my old phone had to make another id and password
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See if you can recover the ID/password. Use every email address you can think of.
Apple ID - How to find your Apple - An iCloud e-mail address is an Apple ID.
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password on the sign in page. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.
If necessary, if you are the original owner, contact Apple. Apple can remove the ID if provided the required paperwork to include the original purchase receipt with the serial number on it.