You can try to clear and start over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-online/00/26444
How to switch to the Free File website
https://ttlc.intuit.com/community/downgrading/help/how-do-i-switch-to-turbotax-free-file-program/00/26264
Or one thing you can do is buy a lower version of the Desktop program like Deluxe. Then you can switch from Online without starting over. You can download the .tax2020 file from online for free and open it in the Desktop program (any version). And the Desktop program has several other features and benefits over the Online version too. See the Desktop CD/Download programs here, https://turbotax.intuit.com/personal-taxes/cd-download/
How to switch to Desktop
https://ttlc.intuit.com/questions/1901476-how-do-i-switch-from-turbotax-online-to-the-turbotax-software