Deductions & credits

Yes I filed a 2019 return, and did not claim any dependents. I was married in 2019 and no longer am. I want to be able to get the Earned Income Tax Credit. According to TurboTax if my 2019 earned income was more then what I made in 2021 then I can apply that earned income to my taxes. How would I calculate that earned income from 2019 if I was married then and we filed together.