Let me ask about your personal experience?

When you have an illness, do you want a specialist who knows the problem and immediate solution OR a general doctor than helps with colds? Yes, part of the answer is that the specialist earns much more because typically they have put years of effort into solving that problem & they solve it fast.

As a coach, I suggest our mind points us to a non-logical answer to this question. Our fear-based mind sees scarcity, "not enough", so it thinks a general client base is "safer", will feed us, but fear drives away clients. Shift your inner world, your mind, to an abundance mindset. Focus on the great number of people with the specific problem you want to solve. Also, many starting entrepreneurs are addicted to variety so they resist a specific niche they can invest years into.

A coach can help you grow your inner mindset as well as the outer-world practicals like niche.