[Kludge]

Like any hobby, do NOT burn yourself out. If you get stressed or pissed off at something, just quit for a few hours. Do something else to get your mind off of it. You'll get nothing done of you're in a bad mood. And always give yourself something to work on. You'll start to forget things, and you won't gain any experience. Make a mini game or look for project ideas online.

I'll try out the Mini-Game Idea for once.
I am looking for projects to do in the meantime though.

Build a backend calculator to utilize in order to streamline and make more robust any specific maths your application leans on for its core operation. It was the last thing I was working on in BASIC about 15 years ago. I know your CPU is better at maths than any of us, but putting a more robust operation to use over and over at any point instead of adding the code for the math as you go along.
That might not make sense, but if you look into mathematical theory for fun at all, telling your CPU to do its calculating in a very specific way would be another use of that type of reference script.
I never got to test my theory that referencing a mathematical engine when I need something done rather than telling the program to do it's work on the back of its hand then and there so to speak.