How can I become a better developer?

Hey guys sorry for this vague question.

I've been a junior react dev for 2 years.

I'm very comfortable with Javascript, react, redux, webpack, ES6 etc

But I want to get a good job, for that I need in depth knowledge.

But I don't know what to learn anymore.

If anyone could suggest projects, topics, anything at all that will help me become a really good developer it'd really hell me out.

I don't wanna stay junior developer with limited knowledge my whole life. I u wanna contribute to open source, publish my own libraries but whenever I look at other's code to contribute it feels so complicated to me. I also wanna work as a freelancer at hackhands, codementor etc but I lack the skills.

Apologies for this broad question.