With good understanding and communication in English, you can travel around the globe. Because it is the international language for foreigners, it's easy to get assistance and help in every part of world. You can test it by online travel. Any travel booking site you can find will have English as a booking option.
English skills will also help you in any business venture you choose to follow. If you visit some offices, companies, governmental organizations, or even math or engineering companies, you will see the importance of English. Any big company will hire their professional staff after getting to know whether the people they are hiring are good at English or not. Companies who want to function at an international level only consider their staff well educated if they are good English speakers, writers, and readers.