Horizontal vs vertical growth - advice : use ladder - use both

Explain roughly how something works, but leave out the details so that you're still an important aspect when it comes to that, but at the same time, you're perceived as a team player and even a leader

if you don't talk how you do things - you may become guru.
if you help others and teach - you are team player.

but gurus don't get promoted - cuz they are experts, boss wants guru to stay at the same position.