From What if you stopped? by Seth Godin:

What would happen to your audience if you shut the doors tomorrow? (I know what would happen to you, that's not my question... what would happen to them?)

What would happen to your customers and to your prospects if you stopped doing your work?

If you stopped showing up, if you stopped selling them something, would they miss you if you were gone?

If the airline went away, we'd just find another airline. If the cookie cutter politician went away, we'd just vote for someone else. If the typical life insurance agent...

Does it matter if it's you doing the work?

Seth's final question should hit home for many. Whether you're talking about your business as a whole or your own personal contributions to your work and this world — does it matter if it's you doing the work?

Become a linchpin to your customers, to your organization, and in this world to where if you stopped, they would miss you.