Listening
Listening plays a very crucial role in learning, understanding, and gradually speaking a language. Try to immerse yourself in the Japanese language to the maximum. YouTube videos, movies, music, radio programs, audio podcasts, audiobooks are all different ways to listen to the Japanese language. Also, repeating what you hear is not only helpful in improving your pronunciation but also plays a crucial role in getting a grip on speaking skills in a comparatively shorter span of time.
Find native Japanese speakers to practice
You can make use of language exchange programs where you get an opportunity to communicate with a native Japanese speaker and thus learn the language. Your time is your investment here as you need to teach your native language to that person for the same amount of time. You can learn both formal, informal, and slang through this method. Additionally, another benefit that you have is you can use the time to learn about Japanese culture and customs and traditions during the conversations.
Make use of the free time you have in different ways
I don’t have any free time. This is what probably came to your mind immediately after reading this. Yes, you might be very busy with your professional life, however, if we work towards it, we can always find some free time that can be used to learn Japanese passively. If you are a music lover you can listen to Japanese music when you are trying to learn Japanese. You can use this trick to swap all or some of your leisure time activities with different activities that involve the Japanese language. This can be fun, entertaining, and learning in a passive way.