Just think of becoming Lucid! What else?!?

To be more specific, think of the previous dream that ended, only this time imagine yourself becoming Lucid in it. Or think of another scenario you want to dream about, and imagine being Lucid in it from the beginning. That should work, and once it does, and you're in the dream, do an RC. I find doing that reassures me that I am in the dream state, and it strengthens the dream.