I appreciate the sentiment of 'making your own luck', and while I think that it is true to a certain extent, there are also the opposite cases.
Let's look at one totally random example off the top of my head - Grumpy Cat. Now, GC's owners basically sat there while the owner's brother I believe, posted the cat's picture on social media, which turned into a storm that netted GC's owners multi millions of dollars in marketing deals. Sure there was probably some hard work after the fact in managing those deals, but initially, it was just pure dumb luck of the cat's picture being posted in the right place at the right time to ignite the response of the world. Tons of other cat pictures go unnoticed every day.
I had a client many years ago - a nice chap, but not what I would call a good businessman. He had trouble stringing a coherent sentence together, and had a bad drinking and gambling problem. Only he happened to start an aboriginal art retail business right when 'Crocodile Dundee' came out and Australian Aboriginal Art was the big thing. He basically had a $1M annual turnover business overnight, and had no clue how to manage it. In fact, we were called in to run an audit because some of his employees were embezzling truckloads of money from him right under his nose. He just lucked into a thriving business but not due to any sort of acumen or hard work. Next door to him there was an auto mechanic business I also worked with whose owner (who was in a wheelchair BTW) worked 80+ hours per week to struggle to put food on his family's table. I found it hard to look at these two businesses literally running side by side, and say that it was anything but dumb luck that separated them, regardless of hard work.