I doff my hat for those who have discovered their niche and can stick with it. It actually takes time and some effort to discover and stick with your niche.
I think one of the things that make people niche down is when they discover that part is very lucrative, just few people niche down due to passion.
And for me, a way to niche down as still not become boring is to make sure you're creative with anything you do.
Thanks for this, I'm anticipating the second part.