You will become a better developer if you study more mathematics or statistics.
You will become a better developer if you study psychology and interpersonal relationships.
You will become a better developer in many, many ways.
Keep studying. Keep growing.
Don't get me wrong, I can see a huge difference in my skill based on how I solve problems now vs a few years ago and while that change came from new things in the C#/JavaScript landscape it was still caused by learning how to code differently.
But I feel like I'm at a level where if I have 10 energy points to spend they will go a lot farther if I spend them on something other than programming.