Wrongly claimed dependent tax credit instead of child tax credit

I have a kid born in 2019 who was included in the 2019 tax return that I filed through turbotax. While filing the 2020 taxes I noticed that for 2019 tax return I had wrongly claimed my child as 'other dependents'.  So instead of the $2000 child tax credit that I am eligible, I received just $500. Is there any way now that I can claim back that $1500 from 2019 ? Can I file an amendment on my 2019 taxes ? If yes, is there an easy way to do it without going to a tax consultant ?