No matter what the language, constant exposure to it is key to improvement alongside consistent study. Consuming Japanese media in the form of anime, TV shows, books, games will help to reinforce words you’ve learnt, practice your listening to a variety of accents, dialects, show you how words and grammar are used in context and finally help improve your concentration.
Games can be good if you’re used to them in English, as switching to Japanese is not as hard if you know the general gameplay mechanics, menus etc. I make an effort to switch everything to Japanese, including my phone, computer etc. I recommend you do the same!
