Focus on languange that is relevant. Think of it like using a tool, we master tools by using tools. We learn tools fastest, when they are relevant.
Use it as your way to communicate.
Understand the messages. Focus on undertanding the messages first, then you will unconsciouly acquire the languange. A study even shows that people who had learned comprohensive input approach outsould people who had learned grammar and formal study.
Your psychological state matters. If you are in state of being happy, relaxed, and enthusiastic, you are most likely learn and absorb new information quickly.