How would your studying change if you had to switch to just using your ears?
What benefits might you get from listening twice as much as you read? Could you improve pronunciation? Get information from podcasts? Improve your ability to understand native speakers? Practice transcribing what you hear on audio? Reinforce vocabulary by listening to audio that comes with your textbook?
What portion of your studying is listening? Is auditory your dominant learning style?
Do you make recordings of yourself speaking and listen to them? Can you hear how your speech differs from a native speaker?