No! You should stick with the same account every year. That allows us to automatically transfer your info over and it simplifies access to your prior-year returns since they're all under the same account.
The only time you should create another TurboTax account is if you're doing someone else's return, so you don't overwrite yours.
Even then, you should continue to use "their" account for their returns, if you're planning on doing their taxes next year.
Please note that we are unable to merge multiple accounts at this time.