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Is the insight here that you should have comparative advantage at this? And that your expertise should be describable? Those two are useful.

Otherwise, "be really good at valuable hard things" is not actionable.

i think you can distill it down to:

“You don’t want to be the best at what you do, you want to be the only one that does what you do” -Keith Rabois

Oh and don’t forget that whatever it is you do should be valuable to other people