Yes--you should set up your own new account with a new user ID. It is too messy and difficult to remove all of the "spouse stuff" from an account that has been used for joint returns in the past.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
https://turbotax.intuit.com/tax-tips/marriage/video-taxes-divorce-heres-what-to-know/L8gReKTj8
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