Lucid dreaming has definitely helped improve my life, although in a somewhat indirect way. I actually wrote a college essay about it... Turns out the subject of how lucid dreaming changed my life works for almost any prompt. Anyway, if you're looking for a personal testimony, I'd be happy to help you.

I can think of a book that might be helpful for you, depending on which direction you decide to take with your project, but I can't remember the title right now. It's about dream yoga... Tibetan dream yoga, I think. There is a lot of stuff about how you should live your life rather than directly about lucid dreaming, so it may or may not be what you're looking for.

Is your project about how lucid dreams themselves can be used to improve your life, or how learning to lucid dream can improve your life?