we really can't help you because we can't see your return or data nor the prior year's return. first, recheck everything. a misplaced decimal point, missing or extra digit can have a substantial effect. I don't know if live support is still available. that would be the next step. after that, it would be using a tax pro. I would say this. if you believe that 2020 was much like 2019 where you didn't owe a ton of money, it's most likely you made some sort of entry error or answered a question incorrectly.
