I am a native speaker of the English language with 6 years of Spanish schooling. After re-establishing a fluent Spanish speaking status what should be the next language to learn?
Latin seemed like it would be the most useful, since the goal is to learn as many languages as possible. As Latin is the base of many languages I plan to learn, it might be helpful to know the language that they are created from.
I'm looking for scientific studies that offer any insight as to what languages would be most efficient or objectively advantageous to learn given the two languages I already know.