Ask HN: What functional programming language should I learn?

I've dabbled in functional programming languages over the years but never got around to getting good at any one of them. I want to change that this year and build up some expertise. The question is, what language should I pick?

Here's what I have dabbled in in the past -

* Haskell * OCaml * Clojure * F# * Elixir * Scala

What would you recommend? I want to be able to build simple CLI programs as well as use it for web application development (for hobby projects).