Invest in audio courses such as Pimsleur and Teach Yourself. Most of the content is dull, however, it provides easy access to listening material. Also, ensure you maximise your time by listening everywhere you can.
Talk to native speakers as soon as possible. You can find them online. The app Hello Talk is particularly useful for this purpose.
Learn how to read the language. My Chinese learning kicked off once I became more comfortable with the script.
Practise listening and following a reading passage at the same time. I found this particularly useful for building fluency.
Try to regard the skills of writing, reading, speaking and listening as separate skills: you won’t naturally be a competent speaker if you merely listen and vice versa.