你好!You have studied English in university, I think it is better for you to specialize in languages such as English or Japanese in Japanese university. You might be able to become Japanese teacher in China or Chinese teacher in Japan. Since the number of people studying Chinese is increasing , there are more opportunity to teach Chinese than English. Of course, you have studied English, you can use it in Japan as some Japanese can understand English.And in spite of requirement to go to Japan, N3 is high enough to apply for student visa.Also you need to have more than 20万元 of money in a bank to certify that your living fee is enough to live in Japan. Have you decided a school you want to study in Japan?Sorry, I cannot write Chinese well because I am foreigner.