To access your prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
Start the 2023 online tax return by entering some personal information then click on Tax Home on the left side of the screen.
On the Tax Home webpage -
Scroll down to the section Your tax returns & documents. Click on the Year and Click on Download/print return (PDF)
If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created. TurboTax does not store online any returns completed using the desktop editions.
If you can't download the pdf file from Online you need the 2021 program installed to open the .tax2021 file. Did you use the Desktop installed program for 2021?
Or You could try the TaxPrinter service (not connected with Turbo Tax) to convert a .tax file to pdf at
They might be expensive and it is probably not safe to email tax returns back and forth.
OR get a copy from the IRS -