FBM Delivery Estimates Way Off

Hello, I understand that I have very limited control after downgrading to an individual seller account. The shipping delivery estimate says it will take 1-3 weeks, which is much, much longer than it should take. I was able to choose 0 days for handling time and it still gives such a long estimate. Is there any way around this without upgrading to a professional account?

Has anyone had success selling their product without a professional account?