I keep thinking of new niches – need help sorting through what to think about it

Every few days, I think…ooh that’s a really good niche
I have a running list of 10 now.

Some of them are related, but others target completely different audience.
I think because all of them reflect who I am and all the different roles I play in life (physician, educator, mother, etc).

Is this just indecision? Do I just need to make a choice and start?
Or Is it okay to be diverse like this as long as I am really clear about each “avatar” so to say?
Or is there some process to decide which one is the “best”

Haha, I can see that these are all just thoughts, but would like to hear what you think anyway 🙂