I don't think you should do anything but wait and see what happens after they process your 2020 tax return. You will probably have to wait for months - possibly until the end of this year.
What I think will happen is that they will apply the 2020 refund to 2021 estimated tax. Then sometime later, perhaps several more months later, they will notice that you overpaid for 2021 and they will send you a refund of the excess payment. They will not apply the 2020 refund to 2022.
