Reddit: What are unsuccessful people doing wrong?
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Also (and this is probably controversial) I would assert there's an ethical problem with the question, in that it puts an a priori burden through assumption on someone (even hypothetical) who by definition is vulnerable. Again, it's just not the right way to approach the issue.
I've seen too much in my life to buy into the premise of a question phrased in this way; it would be asking me to ignore the obvious. The most successful people I know (and they are very successful in their fields by any definition) got there more by their surroundings and circumstance than anything else, and it happened in very obvious ways that I've seen tested in "natural experiments" of sorts (for example, where they move from setting A to B and back again for reasons that have nothing to do with them). Sure, if they were incompetent or unambitious or something they wouldn't be where they were, but when I think of others who are similarly competent and ambitious, the biggest differences I see are in the opportunities they were given, the social environments they are in, and weird quixotic dynamics of life and society.
One of the most frustrating things to me about this all is that if you tried to capture these things with some kind of simple description it would be impossible. Something that looks like an opportunity from the outside might actually be a really horrible catastrophe from the inside, or vice versa.
It's much easier to break something than to maintain and develop something optimally, and this goes for human lives as well. I wish we would focus more on the latter and less on blaming the broken for the former.