Sorry---if your son turned 18 before the end of 2021 you cannot get the child tax credit for him. You can only get it for a child who was NOT 18 by the end of 2021. If you did not get the 3rd EIP payment of $1400 for claiming him yet you can get it as a recovery rebate credit on your 2021 tax return. But if you already got it last year you cannot get the $1400 for him again.
If you qualify for earned income credit it will be added to your refund automatically. It will show up on line 27a of your Form 1040.
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