I was a Rails user for almost a decade. I switched to Phoenix/Elixir 3 years ago. Elixir is a super simple language. It has no OO concepts and everything is functions first. In fact, it's so good that I started teaching it for universities. All my production web applications are now fully on Elixir.
Elixir is one of those languages where everything has been done perfectly as of the time of this comment. When I say perfect, I mean, there has been never once in my career where I hit a roadblock due to the language's limitation or complexity or flawed assumption. I faced this with other languages, but not Elixir.
I'm currently a full time consultant writing, teaching and deploying production apps for clients in Elixir. Most of my apps have served my clients well beyond my contractual agreement. It's almost deploy and forget because of Phoenix. It also scales amazingly well. It's extremely performant.
I just re-wrote the entire crappy mess Wordpress core in Elixir and enjoyed the process. In any other language, I wouldn't be saying the same. It's really an enjoyable language that forces you to rethink the way you write code. Don't be put off by this statement, I mean that in a really good way. And once you start thinking interms of functions, you just won't touch any of those terrible OO programming paradigms (Eg. writing for loops, nesting conditionals, etc.). You will start writing maintainable, beautiful code.
You will appreciate Elixir a lot especially if you have a background in horrible programming languages like Javascript. You will literally start finding ways to use Elixir in your entire stack like I am. It's that good.
Enough said. Give it a shot.