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.
KYC yet or not KYC yet, you have to contact support for password reset or 2FA reset if your automatic reset through email does not work. I don't know any other way to do that, assume you already completely failed by trying many passwords manually by yourself.
Usually platforms have their tools to automatic lock your account after many failed password attempts, just OPSEC.
Accounts with KYC-verified will have more easily and smoothly recovery than non-KYC accounts but you will very likely have to submit your KYC again in case your account has big fund inside and the company has to make sure you are the real account owner.