Can you not simply look at your 1040 (1040-SR)? Your AGI is on Line 11.
Found a Sample IRS Transcript. AGI is on page 3......Adjusted Gross Income
https://www.irs.gov/pub/irs-utl/New_Tax_Return_Transcript.pdf
Do you need last year's AGI to efile? AGI is Adjusted Gross Income. Find last year's AGI
https://ttlc.intuit.com/turbotax-support/en-us/help-article/internal-revenue-service/find-last-year-agi/L0SiDtTNI_US_en_US?uid=lnddfysf
Is your e-file being rejected for AGI?
If it was rejected for AGI—-be aware that many 2021 returns took so long for the IRS to process that your 2021 AGI might not be in the IRS system. Try using zero instead.
If filing with zero is rejected then file again but select the option that you did not file last year. The IRS does not see that question and it will allow you to e-file with no AGI question.
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
If that does not work and you still cannot e-file, then print, sign, and mail your tax return.