The stimulus payments are based on your 2020 Adjusted Gross Income (AGI). If this AGI qualifies you for a higher amount than what you have already received, you can claim the difference as the Recovery rebate credit on your 2020 tax return (line 30 of your form 1040).
For the second stimulus, if you made a mistake in reporting the amount of stimulus received, the IRS will identify the error and adjust your refund.
Please read the answer to question D2 of this IRS Q & A and this TurboTax Help topic.
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