Try Chika Sensei's “Advanced Japanese Course” for 5 Days for free. https://japanasubi-en.com/lp/advanced_course-2/ To those who've passed JLPT N1, and those who want to pass… If you want really excellent Japanese, you need to add new input every day, and you need a teacher who can correct small mistakes and expressions peculiar to non-natives, and help you express yourself in more natural Japanese. You might use Japanese every day, but do you find yourself using the same words and concepts repeatedly? To really master Japanese, you need an increasingly large vocabulary and the ability to use it correctly in a wide range of subjects.