If you are just learning, you need to have small wins to keep you excited about the language. So, I’d say along with the fundamentals, learn the DOM API, Learn Async + Await, and learn a new visual API like web animations.
Understand the fundamentals. The master of the basics, is the true master of the skill.
If a problem bugs you so much, don’t ignore it. If you think it’s being overlooked by many, solve it. Build something. Just do it.