If you carve a niche for yourself, you organize your work to create a secure position.
The firm has carved a niche for itself in handling claims for compensation.
Tommy has been carving out a niche in local politics.
See full dictionary entry for niche
carve a niche
or carve out a niche
to create a secure position for yourself, especially at work
He has carved a niche for himself as an ABC television commentator and is certainto be kept on as long as the network continues to broadcast Saturday matches.