Ask HN: What is beyond JavaScript?

I have done JavaScript programming for most of my six years career, with some Ruby here and there. While I do enjoy JS (React, Node), and I'm glad to see the ecosystem getting better and better; I am getting tired of the constant change and how much effort it takes just to keep up with the latest hype.

What are other languages that are as ubiquitous as JS is, but more stable?

I don't have a CS background and I'm interested in alternatives that would have good employment prospects. I don't mind moving away from the browser, languages like Rust or Elixir/Erlang sound interesting but I question how much of a market there is for these skills without a CS background.