Can I use federal tax credits and/or deductions carried over from 2018 taxes that were not used on my 2019 return? I did not realize I had them to use last year.

2019 was the first time I used Turbotax. Before that I used a CPA. So I didn't look at his notes from the year before to see the carry-over to 2019 return. I just wonder if I can still claim them on 2020's return.