How do you balance learning new technologies with deepening existing skills?

I’ve been coding for a couple of years now, mostly with JavaScript/React on the front end. Lately I’ve been feeling torn between diving deeper into what I already know (getting really solid with React, design patterns, testing, etc.) and exploring new stuff like Rust, Go, or even backend frameworks I haven’t touched yet.

For those of you with more experience, how do you personally strike that balance? Do you focus on mastery of one stack before branching out, or do you like to experiment broadly and then specialize later? I’d love to hear how others approach this.