Kylie Jenner - joins billionaire club

Breaking Zuckerberg's record of becoming billionair at the age of 23, she is just above 20 years now (I believe) and have joined the club of 60 billionaire women.
https://www.forbes.com/sites/forbesdigitalcovers/2018/07/11/how-20-year-old-kylie-jenner-built-a-900-million-fortune-in-less-than-3-years/

Achievement is great. and I congratulate her for this achievement!

But I have ask for those billionaires, what do you exactly see it as when starting at first step?
Do you imagine the billionaire mark first then making it an inspirational thought for yourself and keep doing efforts to achieve it, OR is it like you first study the path like market (customers potential/requirement), products, THE idea, & investment, then plan well, and finally execute it with the straight vision of converting the idea into a reality?

Is there any role of luck/fortune (which I normally don't believe, because fortune is made by the efforts put in today, and it does not exist beforehand)?

Let me know in below comments.

Here are my other blogs:
https://steemit.com/etf/@blk007/etf-coming
https://steemit.com/bitcoin/@blk007/where-is-bitcoin-heading
https://steemit.com/cryptocurrency/@blk007/ripple-effect-future-of-xrp
https://steemit.com/electroneum/@blk007/today-s-big-news