To improve your English by yourself, you can start by reading books and articles in English. This will help you understand sentence structure and learn new words. You can also watch English-language movies and television shows as well as listen to English-language podcasts and music. Additionally, practice speaking and writing in English as much as possible. You can practice with a friend, look for an online language app, or take an English class. Finally, make sure to stay motivated and have fun with it.