The IRS does not permit someone who did not qualify for the free file version to upgrade from that to a paid version. Therefore, you have to literally start over in a paid version. The online software is going to be gone after midnight tonight. You need desktop software to download to a full PC or Mac to complete your 2018 return, which will have to be printed and mailed, since e-filing shuts down too.
https://turbotax.intuit.com/personal-taxes/cd-download/