What are some reasons for learning a foreign language if you have no foreseeable reason you might use the language, and most users of said language speak your own language fluently, anyway?

In college I couldn’t learn a language—not German, not Latin, not even Spanish which would have been useful since its all around us and comes in handy when someone needs help or assistance. I opted on writing dissertations on West Norden—the culture and geography.

But now, there are better techniques for learning languages. I picked up some Spanish through Missionary activity. And Apps are available to learn almost any language.

I am still wanting to learn the languages of West Norden including Icelandc, Faeroese, Norwegian— and have also liked Yiddish due to my involvement with Jewish studies. I still like Esperanto, for even though English is supplanting the role of a universal language, Esperanto encompasses a global dream that is still around, albeit modified, but kind of as it existed in the 1962–1987 era.

I cannot learn all of this anymore at my age but what should I take up, and what should be the reasons?

I am also not sure if learning things just because you like them is not a kind of vanity. It seems all this “spare time” it takes to learn should instead be consigned to some way of making the world a better place.