Honestly, Can’t decide on niche

What if I honestly cannot decide on a niche?
It’s not that I have too many ideas or passions I just really don’t know where to put my attention.

I am a trained certified life coach. And have confidence in my coaching so I am not using that as an excuse.I want to work with Christian women on their thoughts and improving their life. But beyond there I really don’t know. I don’t want to fake it. So is getting started as a general life coach better than not starting at all? All that I hear is if I don;t have it niched way down then I am not going to be successful. Do you have an exercise I could do?