I am in the same situation, sole proprietor running a DBA, no corporation or LLC. The QBI is designed for pass-through businesses like mine and presumably yours. It is up to you to make the legal determination as to whether you qualify for the QBI but right at the top of the Schedule C form (which you should be filling out if you have a business) is a box for you to click to enable the QBI.
https://ttlc.intuit.com/community/credits-and-deductions/help/what-is-the-qualified-business-income-...
However, I would not be using the 2019 program to fill out my 2020 taxes. I am not a tax professional and have no idea what has changed between 2019 and 2020 but I do know that tax code can change and I would not risk using an old program. I do recall when they child tax credits dropped annually and using the old form would have given you too high a tax credit.
