Is it about unemployment? Why do you need the AGI?
If you already filed and didn't get the 10,200 unemployment exclusion you do not need to amend. The IRS will be adjusting it for you. See,
https://www.irs.gov/newsroom/irs-to-recalculate-taxes-on-unemployment-benefits-refunds-to-start-in-m...
You can log back into your return and it should automatically update your return and show you the new refund. But the updated return won't be sent. The IRS will adjust it for you.
Find your current year AGI
https://ttlc.intuit.com/community/agi/help/where-can-i-find-my-current-year-agi/00/26310
