TurboTax accounts cannot be combined or merged with other accounts. If you plan to start a new online account you will be starting it from scratch. Keep a record of the account and user ID for the old account so you can get into it if you need to.
You could just update your account with your new email.
https://ttlc.intuit.com/community/account-updates/help/how-do-i-update-my-turbotax-account-informati...
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