1, say more. Always talk with people in Mandarin, and learn Mandarin from others during the conversation;
2. Read more books and insist on reading books and newspapers in Mandarin;
3. Listen more. When listening to the radio and watching TV, try to learn Mandarin and imitate the pronunciation of actors and announcers.
4. Learn Chinese Pinyin, and look up uncertain words in the dictionary.
In addition, learning Mandarin depends on persistence, continuous learning and learning everywhere. In this way, I believe you can learn well.