Everything is contextual. If you want to do webdev you could learn JS or PHP or something. If you wanted to do data science then Python or R would be a good step. If you like the idea of exploring languages for shits and giggles go with elm or Clojure or Haskell or something. Really depends on what you want.
Rust seems like an interesting choice for you since it's a system language but also gets used by web devs in some situations. Go might be another good choice.
Again though, it all depends on what you want to do with your time.
Comments
Everything is contextual. If you want to do webdev you could learn JS or PHP or something. If you wanted to do data science then Python or R would be a good step. If you like the idea of exploring languages for shits and giggles go with elm or Clojure or Haskell or something. Really depends on what you want.
Rust seems like an interesting choice for you since it's a system language but also gets used by web devs in some situations. Go might be another good choice.
Again though, it all depends on what you want to do with your time.