No and even if you could it only would transfer basic info like name, address, ssn, and AGI. You really need the data file ending in .tax2020. Was the .tax2020 file too large? How did you do 2020 return? Online or in the Desktop program? Do you still have the 2020 program installed?
Here's an idea. 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. Then start a new 2021 return and transfer from the 2020 file.
