You don't become indispensable merely because you are different. But the only way to become indispensable is to be different. That's because if you're the same, so are plenty of other people.
Seth GodinThe goal in blogging/ business/ inspiring non-fiction is to share a truth, or at least a truth as the writer sees it. To not just share it, but to spread it and to cause change to happen. You can do that in at least three ways: with research (your own or reporting on others), by building and describing conceptual structures, or with stories that resonate.
Seth Godin