How can I recreate a new iCloud and delete the old one?

Don't quite understand your question.

Do you have multiple Apple ID?

Have you forgotten your Apple ID?, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

https://support.apple.com/en-us/HT201354                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

Deleting Apple ID account: https://support.apple.com/en-us/HT208504

Creating new Apple ID account: https://appleid.apple.com/account

Note that you cannot delete jus an iCloud account. You can delete the AppleID used with that iCloud (link was provided above) but that deletes everything associated with that AppleID. You would have to repurchase all apps in order to be able to update them. You will also lose your current FaceTime account, and iMessage account and will have to make new ones.