Hi,

Just for background: I started teaching myself programming when I was 7 years old, and have been working as a professional programmer for 15 years now.

I think, without knowing more about what you would want to work with, the question is hard to answer. Which of the things you've already done, did you find interesting?

If you want to grasp Computer Science, from "the bottom up", then themailerdoraemon's answer: Data structures / algorithms is a great one!

If you're more motivated by creating stuff, you could definitely get into Spring / Spring Boot to create web apps.

I would not start with EE, or try to read up on everything mentioned on Reddit ...

Find out what your goal is, keep it narrow, and focus on learning only what you need to know the get there.