It’s highly advised that you take a foreign language- particularly a popular one (I don’t mean to dissuade you from independently selecting a language which interests or has cultural/ancestral significance to you, I’m simply being honest.) That said, languages which look good to colleges, but aren’t the most difficult to master for a native English speaker, include German, Spanish, and Portuguese. Though you may think “Oh, everyone takes Spanish”, while there’s truth that many choose Spanish as an alternative language, it looks much better than taking a language which has no real use outside of specific situations or in its native country. Aside from this, obviously, Mandarin Chinese and Arabic are excellent languages to uptake.
With that, I encourage you to take some form of language if it isn’t already too late for you. Colleges love to see an alternate language aside from English (or your native tongue). Shows you’re diverse in your education, interests, and skill set. 