If I look at your stated goals then maybe you could learn a pure FP language like Haskell or Clojure, because it's a totally different paradigm. But they're pretty hard - maybe something like Elixir would be more gentle (very good tooling and a focus on "developer happiness"). Another one I can recommend is Rust (which also supports some FP concepts), that's a very well designed language.
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If I look at your stated goals then maybe you could learn a pure FP language like Haskell or Clojure, because it's a totally different paradigm. But they're pretty hard - maybe something like Elixir would be more gentle (very good tooling and a focus on "developer happiness"). Another one I can recommend is Rust (which also supports some FP concepts), that's a very well designed language.