My child tax credit is showing only 500 per child, but it was 2,000 per child last year. They are all still eligible. Any advice is appreciated.

If they are older than 16, you lose the child tax credit and get the $500 credit for other dependents instead.   If they are under ager 16, you have answered something incorrectly in MY INFO.

Make sure you have entered your child as a dependent in My Info, and that you have entered the child's Social Security number.    Careful— do not say that your child’s SSN is not valid for employment.  If your child was born in 2024 make sure you said he lived with you the whole year.  There is an oddly worded question that asks if the child paid over half their own support.  Say NO to that question.