To get the most out of your investment in private music lessons, it is crucial to include "musical input" in your every day life. Musical input is simply listening to music!
-Listening to recorded music on your instrument, of the pieces you are learning. Listen to your preferred style, and other instruments and styles as well. Listen to everything and anything you can get your hands on.
-Going to concerts
-Watching videos of live performances
-Singing and making music with family and friends
Musical input is so important because it builds the "inner ear." Just as it would be difficult to speak a language you've never heard before, it is more difficult to play music when you have no aural reference for how the music sounds.
You can listen "passively" playing the music in the background as you are doing some other activity, or "actively" really paying attention to music, maybe even singing along.
It's really as simple as that. Include a little bit of music in your everyday life and watch your musical proficiency reach new depths.