It actually does not matter how you file your returns. What matters is the information entered on your returns as submitted on your original return.
You will not be able to submit your return electronically again as the IRS will show that this return with this identification number has already been submitted and therefore will reject the filing.
If based upon your input into TurboTax, you see the amount is different than the return you already filed, you would need to prepare an amended return to reflect the corrected information and then file that return with the IRS.
Do I need to amend my return
I have included a link below with steps to amend your 2020 income tax return in TurboTax.
How to amend your return
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