[ Niche ]

Specialist expertise in something like piping design, or photography, or materials science might be called a niche specialisation.  Having a niche is a good strategy for career building.

Knowing what in particular that you’re good at is a key facet of job satisfaction.

I’ve mentioned before that the four aspects of career building are: community/connection (most work isn’t a solo sport), impact (know how you’re making a difference), autonomy (be able to do some work undirected), and mastery.  Mastery is usually in a niche area.  It’s difficult to be a master of everything, so pick a niche and go deep.