Listen to Chinese at every opportunity possible. There are many audio courses available. Buy one, follow along with the guide book, but slowly ween yourself off the guidebook to the point where you can understand what you hear. This is the audio-lingual method, developed for the U.S. military during World War II and still in use by language learners who need to obtain maximum fluency in the shortest period of time.
Go to China. Live there for at least two years. Teach English in a small town with few other foreign teachers and socialize only with Chinese speakers who do not want to practice their English for free. Approach your task with utter fearlessness; when your interlocutors snicker at your accent, forge ahead towards your goal undaunted. Forget the meanings of shame and embarrassment. If it works for babies and infants, it can work for you.
Reflect on your experiences at the end of every day. Recall the people, places and topics of conversation. Record these experiences along with the new words and concepts you met that day in a language learning journal. You may never read it again, but writing it down will help you remember it.