Since your return probably calculated the Recovery Rebate Credit, you will not need to do anything at this point. The IRS has stated they will be pulling returns that claim the credit, and will adjust your refund accordingly. You do not need to do anything else. You should be aware it will take longer to process your refund though.
Please see the link below for more details from the IRS.
Correcting Recovery Rebate Credits on returns already filed
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