No one has access to your account. If you are not going to use TT to file a return, you can just abandon the return and the account, or you can clear out the return you started if you have not gone too far with it to clear it. It will not be filed. No one else can file it for you.
You can follow the instructions to clear it--and then just do not start over.
CLEAR AND START OVER
You can not delete or merge accounts.
You can try to clear all of the information in your TurboTax account for this year but you will need to Contact Customer Support to have an account deactivated for more of a resolution.
You can try to clear it.
Intuit - How to delete my account
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