You lost the child tax credit when the child turned 17. After they turn 17 you get the $500 credit for other dependents, which is a non-refundable credit that can reduce your tax owed. You have not mentioned the child's age or how much they earned in 2024.
IRS interview to help determine who can be claimed:
https://www.irs.gov/help/ita/who-can-i-claim-as-a-dependent
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