I think languages are important. It does not matter which one is the most beautiful. The most important thing is which one can help me earn money. So economically speaking, Chinese, should be your next language. In some private schools, Chinese is mandatory. Rich people teach Chinese to their daughters. You can check by yourself. All the actual students in political sciences are learning Chinese. The elite is learning Chinese. Therefore, I believe it will not be useless. Moreover, languages are always useful. Either for business or simple communication. They are always able to do something positive.