I know I am going to get hammered for this, but logically there is very little benefit for an English speaking person to learn a foreign language, for work reasons. English is now so dominant as a second language that it has become the most likely language to be understood by a non native speaker. The frequency with which a second language would be used, compared to English, is considerably lower.
This is not cultural imperialism nor am I saying that native english speakers should not learn a language. There are cultural benefits and insights which cannot be obtained any other way, but for practical purposes if you can speak English you will be able to communicate with more people than you ever would with your second language.