If you did not get the full 3rd stimulus check that you were entitled to, you can make that adjustment when you file your tax year 2021 return on the Recovery Rebate Credit section of that return.
It is taking longer than usual to get your refund because IRS is trying to do so many things at the same time. They are still processing paper 2019 returns.
Keep checking the Where's My Refund link like you have been and all of a sudden, there will be information for you.
