I think you're right to explore something else and I'm not aware of anything better than Elixir/Phoenix in the Web Framework world currently. It's incredibly well thought out and an absolute joy to use once you get through the initial learning curve.

I spent many years doing Python before getting talked into learning Clojure and it was incredibly eye-opening and made me a much better developer, so there is no bigger partisan than me for trying something completely different to your current skill-set. Give it a go!