Follow the instructions in the following TurboTax FAQ to find out where to put your previous year's AGI on your current year tax return.
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
If you have already filed your return, you won't be able to make any changes until your return has been accepted or rejected by the IRS. If rejected, you would need to correct any information that caused your return to be rejected as well as make any other changes to your return that you see fit, then proceed to resubmit your return. If accepted, you would need to amend your return. You can follow the instructions in this FAQ here to amend your 2020 tax return.
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