I&#x27;d personally look to find what language fills the gap that the current set of languages I know don&#x27;t fill. Clojure is my filler for lisp language and language with good macros support.<p>I use Ruby in the slot that many have Python in but with added coolness of metaprogramming not found in most scripting languages.<p>And to add to that a bit, I found that recently it&#x27;s been getting harder finding new languages with enough new patterns and paradigms to keep me interested in learning and mastering them.