You ask the following: What is the key for success?
Let me start by saying that success has nothing to be with luck. The key for success was cogently pointed by, for example, T. Edison and A. Einstein.
A. Enstein once remarked that it is only in dictionaires that the word "success" appears first than the term "work" (i.e., hard work). This idea echoes in T. Edison idea that genius is 1% inspiration and 99% perspiration or hard work, So, if we want to attain succeess we should follow, say, a demanding track, not a shortcut,
To make a good track is the key to success. But, in my opinion, how to make a good track is almost the same with how to make success. So, it still a question for me.....