Is this a niche?

Hi I am a former financial advisor turned coach. I’ve worked with multimillionaire execs who work all the time and are unhappy. They think money and achievement will make them happy and this is why they have been so driven; but I’ve seen so many of them arrive at mid-life, after having “made it” and are unfulfilled. Oftentimes, their relationships or sense of purpose suffers after so many years with their focus being wealth.

So my niche is “I help unhappy millionaires turn their wealth into something meaningful.” We would do coaching around legacy planning – giving back and creating purpose with their wealth. Is that a compelling offer? Is it niched enough?