If you forgot the password or the email and you've done KYC for that casino, the best way to proceed is to contact the support and let them know your issue; they will guide you on how to proceed in this case.
Creating another account should have a good intention and not try to abuse; it is hard to cheat the casinos; they have an intelligent system that tracks and perceives your intention.
Although they sometimes create an error that the admins need to manually verify.