A cavity, hollow, or recess, generally within the thickness of a wall, for a statue, bust, or other erect ornament. hence, any similar position, literal or figurative.
I couldn't see myself filling some definite niche in what is called a career. This was all misty. Carl Sandburg
I don't really need to stand out, there's room for everyone. Although I haven't built a niche yet, I'm just writing love songs. Adele
There are a lot of authors in the world, so it's difficult to find a unique niche to present your take on things. That is always a challenge for any author. Kareem Abdul-Jabbar
Very much like that, and very much a loner, do you know and I didn't fit really into sport or all kind of group activities as a kid, I couldn't find a niche. And music was not really part of the kind of village curriculum it would, you know. Eric Clapton