I have some friends who say that "learning to learn" (the skill and the book with the same title) is key to being successful; specially if you're not a genius. Through my whole life, I met people who seemed nowhere near as bright as me but eventually got to surpass me both in academia and at work. From what I could observe about these people, the main difference was regularity; these people studied or wrote code every single day; they took small steps, but never stopped. Also there was the point of asking for help, not to get the answer, but to find a way out. There's also the "curse of the genius", but I don't think that is the case.
In the moments I was struggling the most in my life, what helped me the most was managing my time and finding ways to work a little bit every day, even if it was only writing down the plan of what I had to do. Pomodoro timers also helped me a lot to "start doing something".
I really think motivational, self improvement, anti-procrastination and studying advice courses should be offered by universities. I'm convinced that regularity and a good study strategy is enough to move even the weakest among the mediocres to attain a doctorate level. I saw some cases like these myself.
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