The question is, Why ?
did you get checks in the mail for the credit? If a check was lost you have to try to recover that outside your tax return.
did your payments stop sometime in 2021?
did you file a 2020 1040-X? If so, that would do it.
If you try to get the money back by the amendment strategy suggested,
a) it will take over a year for IRS to complete a 1040-X, and/or
b) you may never get it because the 1040-X will be denied.
Use your own best judgement.
