There' no navigation bar to restart my tax process and all of the self-help answers tell me to simply go to the navigation bar on the left of my screen. NOT THERE.

Are you in the right account?

 

Many people have multiple TT accounts and forget how to access them.  Log out of the account you are in now.

 

Account Recovery

https://ttlc.intuit.com/questions/1901535-forgot-your-turbotax-online-user-id-or-password

Or did you use the desktop version of TurboTax?  If so, the files are on your own hard drive or any backup device you used like a flash drive.

 

https://ttlc.intuit.com/questions/1901486-how-many-turbotax-accounts-do-i-have

https://ttlc.intuit.com/questions/1901535