There are two traits that most predict performance in life: IQ and conscientiousness. "Genius", as most people refer to the word, essentially means high IQ. But

There are two traits that most predict performance in life: IQ and conscientiousness. "Genius", as most people refer to the word, essentially means high IQ. But IQ has no correlation whatsoever to conscientiousness, so you can be someone with extremely high IQ but extremely low conscientiousness. If you have low conscientiousness you're going to be someone who isn't particularly disciplined, hard-working, organized, reliable, etc. So you can get these situations where there are geniuses who achieve nothing because they lack conscientiousness. Most people who end up achieving a lot tend to be high in both traits. And of course, conscientiousness isn't fixed. You can improve it through various means. Although if you're extremely low in it in my view you're likely not going to be able to improve such that you can become the most conscientious person out of 100, for instance.