So sorry---but there is nothing you can do The rebate credit can be used to pay your back taxes. If you are eligible for the 3rd stimulus they will not take that.
You can use the IRS Get My Payment site to see what is expected for your 3rd stimulus check:
https://www.irs.gov/coronavirus/get-my-payment
https://www.irs.gov/coronavirus/get-my-payment-frequently-asked-questions
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