Try to speak it..a lot ^^
A good way is to incorporate it into your everyday life. You wake up in the morning, what day is it in English? You glance at the clock, what time is it..in English? You're shopping for groceries..can you say what you buy in English?
Recalling the knowledge frequently throughout the day makes it easier to recall when you're in a conversation. Incorporating it into your life also encourages you to learn new vocabulary so that you can say what you're doing, meaning that when someone asks you a question about yourself you'll already know how to say it.