For an individual or organization, working out what you are really good at, what you can do that delivers the most value, unlocks a lot of good things.
1. You can focus on it disproportionately
2. You can identify under what conditions it is most valuable
3. You can identify the inputs needed to do it effectively
You need honest introspection to find it, and like any introspection doing so is hard: even if something is very successful, pulling it apart from within (accurately) is subtle and challenging work.