You can use the Account Recovery to get your account information.
Forgot your TurboTax Online User ID or password?
https://ttlc.intuit.com/community/account-recovery/help/forgot-your-turbotax-online-user-id-or-password/00/26157
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How do I find last year’s AGI?
https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/00/25947