did you timely file your 2020 return. if you did you need to use schedule A of form 1045 to see if you have a net operating loss. if you had a net operating loss unless you made an election to forgo the carryback period, you must carry it back to 2015 and then any left forward to 2016 -2017-2018-2019-2021. Turbotax no longer supports 2015, so you may need to find a pro.
https://www.irs.gov/pub/irs-pdf/f1045.pdf
