Hello, I still haven't received my full Federal refund from tax year 2020. What should I do and who should I contact? I am missing about 2,000 dollars.

At first, I accidentally filed my 2020 taxes incorrectly by stating that I was "dependent."  In the fall of 2021, I revised and resubmitted my corrected return with "independent."  This was than received by the IRS and confirmed as correct.  However, I still have not received the amount for the 1st and 2nd stimulus checks that I qualified for and never received.  It has been about seven months since I revised and submitted my correct return.  Please help!