I've been writing Morning Pages, off and on, for about five years now. I know I'm more creative after doing them. Things flow more. I don't second guess as much. That creativity spreads to other aspects of your life. I recommend this book and it's exercises, not just for developing your musical creativity, but to elevate the joy you feel moving through life. Also, tend to your inner-child. It might seem like woo woo bullshit, but if you have a non-judgmental inner dialog with the most vulnerable aspects of your psyche, you're going to be amazed at what you're able to create. This is all my personal experience so, YMMV.