You do not re-file the tax return. To change your dependency from the original tax return you will have to amend the return that was filed.
When amending the tax return, in the My Info section of the program you edit your personal information and remove your selection that you could be claimed as a dependent.
An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.
Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.
See this TurboTax support FAQ for amending a 2021 return - https://ttlc.intuit.com/community/tax-return/help/how-do-i-amend-my-2021-return/00/2544441
