Are you using the Online version or the Desktop program?
Maybe last year you marked the Schedule C as FINAL in Turbo Tax?
Here's an idea. Do you still have 2023 installed? Try opening 2023 program and see if you can get your 2023 return to show up in it. Go to FILE - OPEN. And see if your schedule C is in it and if it's marked as finally disposed. Or any Assets were disposed or sold.
