Just thinking this aloud..
"You can only become a sought-after expert in something that nobody else knows to do but need done..
..if you had earlier picked an area of work that was necessary but nobody else wanted to do.
So stop following the crowd, do not go after what everyone wants to do but isn't really needed.
Get out there, find out whats needed and what you can do about it, and with that find your niche in the ecosystem."
-- just another smartass