LLC Deductions

I started an LLC in 2023 for my therapist business. I am the only owner. I had no business income in  2023,  but I had a significant amount of start up expenses.  I was told that I could deduct these on my personal tax return, which I understand, but I was also told (by a supposedly knowledgeable entity) that I could actually deduct and get a refund for more than the amount of tax that I owe on my personal return. This dosen't sound right to me, but just wanted to be 100% sure.

Thanking you in advance.