Podcast is the secret, it keeps your skills alive in terms of listening, understanding and speaking... and as well as reading normal books, not the ones about english lessons. Watching TV shows, movies and documentaries, you just have to choose which one to watch, the ones easier for you to understand and see how actually people speak. The goal is speaking like native people do, and studying grammar and vocabularies every single day isn't just enough, and it might not be an effective method, which doesn't mean it isn't, the method to be chosen actually depends on your english level, just make your method something enjoyable to do and not boring or an obligation. Watch Jack Askew advinces on Youtube.