Are you on Windows? You need the file ending in .tax2020 to transfer into this year. It should be in Documents in a Turbo Tax subfolder. Or Search your computer for all files ending in .tax or .tax2020. And check the Recycle Bin. The PDF file should be saved there too. If you have Windows 10 check the OneDrive. Or to Drop Box. Check your backups. Could it be under a different user on your computer?
If you don't have the main .tax file you might have one that starts with a Tilde sign ~ like "~your name.tax2020".. That file is if your computer crashes or your real file gets lost or deleted or corrupt so you can restore it.
Find your Tax file in Windows
https://ttlc.intuit.com/community/tax-data-file/help/find-your-tax-data-file-tax-file-in-windows/00/...
Here's an idea. Do you still have 2020 installed? Try opening 2020 program and see if you can get your 2020 return to show up in it. Go to FILE - OPEN. Then save it again with a name and place you can find. Go to File - Save As.
