To the many excellent suggestions already given, I'll add something with a bit of a different slant. It's very important to work from both sides of the problem. If you can imagine exactly how you want the music to sound, you can make it sound that way. The connection between your ideas and your hands is very intimate, and I went to no end of trouble trying to "get the notes" without focusing on the music. As I have said many times before (and this for me is a very hard-won lesson), the notes come from the music, the music doesn't come from the notes.
So, work very hard to avoid an idea such as "I will learn to play the right hand louder than the left hand, and then I will learn to play my piece." (This does not mean avoid exercises; I'll get to that in a minute.) Visualize what you want in the piece, put your hands on the piano, and start to play, with the idea of making your vision a reality. When something happens that is inconsistent with your vision, stop and do it over again. If it doesn't happen after a few tries, come back to it later with a fresh mind. If it still isn't happening, it's time to look at purely technical reasons and focus more on exercises for a bit. Again, while doing exercises, visualize exactly what you want to hear, and focus on making that vision a reality. Always do that.