This is one thing I advise people to try.
Typically, it's students at the college where I work but I tell other people to try it, too.
For the students, I tell them to put the digicam away for the summer and just shoot film until they get back to school in the fall.
In nearly every case, I have seen their photography skills shoot up by orders of magnitude when they return.
I don't know if a whole year of shooting film is needed but you should decide for yourself.
If you would rather shoot only film for a month, six months or for whatever arbitrary amount of time you decide, you should still see benefits from the exercise.