The Recovery Rebate Credit worksheet will show how much stimulus you received last year and how much is being added to your refund. I'm not sure what you mean when you say the max credit for both the first and second stimulus.
If you never received a payment, then lines 16 and 19 should be $0. If you got the full amount of both payments then the numbers should be $1,200 for line 16 and $600 for line 19.
Line 21 is the missing amount of stimulus that will be added to your refund as a Recovery Rebate Credit on line 30 of Form 1040,
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