To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.
This will take you back to the 2024 online tax return.
See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/change-mail-e-file-turbotax-online/L0zDlGPhq_US_en_US?uid=mbzje6ii