If it doesn't let you clear and you haven't paid and filed you could just start a new account. Online is only good for 1 return per account. But you can use the same email address for 5 accounts. Start another Online return here and sign up for a new account
https://turbotax.intuit.com/personal-taxes/online/
Or go to the IRS Free File programs
Free File: Do your Federal Taxes for Free | Internal Revenue Service