How do I find a niche?

I have been coaching for a long time, and I haven’t figured out what my niche should be yet. I have coached relationships, business, health, and coaches. Any of those would work.

I haven’t narrowed it down to one of those, and I still need to focus down on how to get people to stop over-drinking Chardonnay.

I feel stuck.

which has led me to not taking action for the past 3 months.