OP said he already works with Python most of the time, so even if I live Ruby as the next guy, it's not a good recommendation. I would say try Elixir since try

OP said he already works with Python most of the time, so even if I live Ruby as the next guy, it's not a good recommendation. I would say try Elixir since trying to go and think only functional for a while can be refreshing and useful also when you come back to the languages you already work with.