You can’t change that status, and you don’t have to. If you’ve
filed a joint tax return with your husband, “his” account is now your account
too. You don’t file a return with your old single account. The IRS doesn’t care
which TurboTax account you use. They only care that a tax return with your
Social Security number gets filed, and that your income and expenses are
reported correctly.
Just leave that single account alone, and don't file a return with it.
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