F#, Elixir, Erlang, Clojure, and Racket is where I would concentrate. Pick one and go for it. Find books that work through a domain in a project-like style and

F#, Elixir, Erlang, Clojure, and Racket is where I would concentrate. Pick one and go for it. Find books that work through a domain in a project-like style and port the code to your language of choice. Check out the course Programming Languages by Dan Grossman on Coursera.