Your 2023 AGI is on line 11 of your 2023 Form 1040.
You have to access your own account and/or print it for yourself using exactly the same account and user ID that you used when you prepared the return.
https://myturbotax.intuit.com/
Start a 2024 return online and enter some personal information so that the menu on the left opens up and lets you access your past year returns.
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Or did you use the desktop version of TurboTax? If so, the files are on your own hard drive or any backup device you used like a flash drive.
You can get a free transcript from the IRS or for a fee of $30, an actual copy of your tax return.
https://www.irs.gov/individuals/get-transcript
https://www.irs.gov/pub/irs-pdf/f4506.pdf
SAVE YOUR TAX RETURNS !
EVERY year before mid-October you should save a copy of your tax return as a pdf and print a copy of it for your records. That way you will not be searching online frantically when you need it for a lender, FAFSA forms, your next tax return, etc.
In order to transfer a past year return to the new return you need the tax file
NOTE: TurboTax and the IRS save returns for seven years. Returns older than seven years are purged.