How bad is it leaning currently? If it's just slightly loose, a quick and effective fix is to smear a thin layer of superglue (cyanoacrylate) on one side of the saddle, sprinkle with baking soda and then sand down to the correct thickness. Not pretty, but it works.
What is it about the tone of your guitar that you aren't happy with? As Matt said, practice is free and probably the single most effective method of "improving" your guitar's sound. Another is to experiment with nails for fingerstyle and different picks for strumming. Those make a really big difference as well.
Having said that, whenever I see something like this: "is there anything I can do to improve the sound of my guitar?" it is often the case that the owner isn't really satisfied with their present instrument, and the only solution is a new guitar
