should I claim my 19 year old son as a dependent if he had unearned income?

My son is a college student.  He made $10,000 in unearned income in the stock market and so we are filing a separate return for him. On my return it says he is "not qualified for child tax credit".  It doesn't seem that we are getting any benefit from claiming him as a dependent.   Would it be better to not claim him as a dependent at all on our tax return?  When I change my son's TT return to "someone can claim me as a dependent in 2020" but "no one will claim me as a dependent in 2020", he owes much less taxes.  Is it ok to not claim my son as a dependent even though he technically is a dependent?  Thank you in advance.