Did you get a 1099G for 2020 unemployment? If you didn't get the payments until 2021 it will go on your return next year.
Or you mean you got your tax refunds in March 2021? You need to amend 2020 to add the unemployment.
How to amend a 2020 return
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/01/27439
