If you have already filed your return and it has been accepted by the IRS, then the only way to file another return under the same Social Security number for the same tax year is to amend the original return to add income or deductions or change the information that was already filed. You cannot file a second return for the same SSN.
See the following TurboTax article for instructions: How do I amend a 2019 return in TurboTax?
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