Ну что посоветовать, сам был в такой ситуации.
If you already speak English well and don't see a potential to improve it, you better ask your hearth and consider following options:
1. You like to take an easy way and choose languages from the same rooth as English, means German, Netherlands, to some extend even French. Those languages are common in the world, there are no exotic
2. Roman Family: A very big tongue family. People speak those languages across the world. There are Spanish, Portuguese, Italian and again French
3. If you like exotic you'll choose something like this: Japanese, Chinese, Philippine, Zulu, Nunuit
4. If you'd like adrenaline and work as an translator in a military translator, wouls suggest you to learn Pashto, Arabic, Somali
5. If you'd like to be an Archeologist I'd suggest you the death languages like old Egyptian, old Greece, Latin etc
6. You see yourself as a future doctor or lawyer? Choose also Latin