Last yr I had windows installed in my house. I only claimed what I had paid thus far on installments. I think I did it wrong and this yr I'm only getting $19 tax credit?

I only claimed about half cost of windows in 2019. Received just tax credit but this year, trying to claim the remaining balance paid in 2020 and only receiving a tiny credit. I must have done something wrong. I have a home office so am doing those types of taxes. Any guidance would be appreciated.