If your model account is attached to a Studio and you want to delete it or make this exact account independent, you need to ask your Studio to detach or delete your model account. Support cannot detach your account from a studio.
A Studio can do this via their account by following this guide.
If a Studio does not agree to remove your account, you still may create a new independent one using a new email address. Once you approve a new account, your documents will be rejected on the studio account.
Please note, that some studios may have a 3/6 month protection period. In this case, the studio will let you know about it and provide the details of this special agreement.
Note: models can leave studios that are blocked forever.
Please see here how to detach your account from a blocked studio.