Here are a few ideas that I had that will improve your musicianship:
-Listen to a variety of different artists. Explore other genres of music. Listen to different instruments.
-Devote a certain time of the day to practice each day
-Get real organized about your practice. Devote certain amounts of time to specific areas, such as 15 mins on arpeggios, or 10 mins on chords.
-Start working with a metronome. Learn how to play along with it. Try different rhythms or strum patterns with it.
-Learn new musical terms. Learn new chord/scale/arpeggio families.
-Read up on music history, watch a music documentary.
-Try learning a second instrument
-Play with other people. Everyone has something to share, if nothing else, what not to do. Jam with people, create jam sessions, or better yet, get in a band. In fact, if you have never been in a band you should get in with one as soon as possible.
-Take lessons from everyone. Get a broad education. I've had countless instructors and each one had a different perspective on things. Sometimes one would have a better way of explaining a topic than a previous instructor.