Start by searching your C:/ drive in Explorer. Then try running a search for your .tax2021 file, the entire hard drive (as well as any external hard drives and/or flash drives) and check your recycle bin.
For more information, please see the following TurboTax FAQ: Find your tax data file (.tax file) in Windows for more information.
If you are still unable to find it, please reach out to our TurboTax Customer support via the Contact Us further assistance here: What is the TurboTax phone number?