Ruby is definitely great and I would have totally agreed a couple years ago, but Elixir has blown my mind. It feels so much like LISP sometimes I wonder, especially with the full macro system where you can operate directly on the AST :-D

Given the recent news on Nx and Livebook, Elixir may be a first-class language for ML very soon.

On a related note, Elixir feels a bit like a functional love child of ruby and python.