When I look back into the economic opportunities I "fell into" the same principle was at work. I did something, did it for two or three reasons, one fell through, another one became important, and suddenly my direction shifted. The same thing is now happening as well.....
In nature in a healthy ecosystem, no plant fills only a single niche, and no niche is filled by only a single species. I guess it took reading about permaculture to see some of my own patterns in a deeper light.
A cave is mostly only inhabited by fungus. There you go, a niche only inhabited by a single kind of organism, and that's not even difficult to find.
Anyways, basing your behavior on how "things are in nature" is as insane as eating bark because you see a bear do it. It's stupid because analogies do not translate at all between things so distant as human and animal feeding patterns, or - in your case - yellowstone forest and business markets. Unless your CEO is Yogi Bear.
But my second point was a general comment about the popularity of the self-help/corporate/utilitarian discourse of "success", "usefulness", "improvement" etc.. You should improve yourself (if that's what you want), but don't become obsessed with improvement. There are other worthwhile and meaningful ways of living - just consider other options.
I'm afraid to sound new-agist ('cause I'm not), but let me suggest that the desire to improve is often the result of an external motivation such as competition. Also, "success", and "improvement" are common words in corporate-speak for two reasons: people who build corporations are often those who are obsessed with success to begin with, and second, people thinking about success and improvement tend to make better employees and better consumers. In general, people overly concerned with success and/or improvement either create authority or serve it well.
So improving yourself is certainly a great goal, but as you do it, make sure that you're improving yourself in order to serve yourself and those you love better - not someone else.