First, some people can get the life they want by learning English, such as taking IELTS and GRE in order to get the qualification to go abroad, taking translation and interpretation certificates in order to get a high-paying job, or even taking CET-4 just to get a diploma smoothly.
Second, English is a practical tool. You can reach a good level in listening, speaking, reading and writing even without taking various qualification certificates, and you will find that it can be applied in all aspects. For example, in the company, you may get some opportunities that others dream of because of your good English, or it is more convenient than others because of your good spoken English when traveling abroad, or you may make more friends because of your good English, and even you can better appreciate the content of the movie while watching the soundtrack, instead of just staring at the subtitles.
Thirdly, what many people don't realize is that a foreign language different from the mother tongue represents not only the language itself, but also a culture. Through in-depth study of English, we can better understand European and American cultures. Through a different language, we can get rid of the limitations of mother tongue thinking and see the world from a broader perspective, which will bring benefits to our brain thinking far beyond the benefits of language tools themselves.
Therefore, if conditions permit, it is recommended not only to learn English well, but also to learn more foreign languages. You will find that learning various foreign languages is of great benefit to developing your thinking ability.