Sorry if your wife's return overwrote your return then yours is probably gone for good. Unless you can find a .tax2020 file on your computer for it.
Maybe you can find a temp file of it.
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.
The .tax and pdf files should be in your Documents in a Turbo Tax folder. Did you at least save a pdf of your return when you finished?
Otherwise get a copy from the IRS. It won't be a .tax file. You can request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript
