My thoughts would be to leave your return as it was filed. When it was filed, you certified that what you filed was true and accurate, including the fact that you were eligible to claim your son as a dependent. Changing your return now should not affect his ability to receive a stimulus check because he could have been claimed as a dependent.
According to the information on the IRS site, if a person was claimed as a dependent or can be claimed as a dependent, then they will not be eligible for a stimulus payment.
IRS - Economic Impact Payment
@Maxlucy
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