From reading between the lines, if the line 28 of your Form 1040 shows $3,000, it means that you did not enter the $1,500 advance Child Tax Credit you received on the original return at all. If you entered $3,000 by mistake as you believed, the line 28 amount should be $0 instead.
Since you over-claimed the Child Tax Credit on your original return, and the IRS had made the proper adjustment based on its records, there is nothing left to claim. The IRS has issued you the correct amount of refund. You do Not need to amend your 2021 tax return at all. You did not lose any credit either.
@Bill7550
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