I recommend the book The ONE Thing, Gary Keller: https://www.amazon.com/ONE-Thing-Surprisingly-Extraordinary-...
The short of it is exactly what you asked for - working incrementally on one small thing. The core of it is a domino effect, where a small thing pushes over a bigger domino. Most of the advice is on how to pick the next dominos. You pick a large epic goal, as a purpose, and a smaller one, which is your priority, and then line them up.
A lot of people were made in a few years, so really, you just need about 10 years to achieve your dream whatever it is. It sounds like you have more skills than most people your age; don't compare yourself too harshly with HN in general.
The one thing https://www.amazon.com/ONE-Thing-Surprisingly-Extraordinary-Results/dp/1885167776/ref=nodl_