See https://www.irs.gov/newsroom/heres-how-businesses-can-deduct-startup-costs-from-their-federal-taxes
If you were not actually open for business in the 2023 tax year, then you would not file a return for the business (Schedule C or otherwise).
Also, your question has a TurboTax Business tag. If the LLC is a single-member LLC (just you), then the LLC does not need to file any kind of separate income tax return (i.e., you report on Schedule C).
