I'm kind of at a weird place with tennis. I'm 3.5, but I will likely soon be 4.0. I play seniors, ladies and mixed. I take lessons, but I am feeling a certain lack of focus. I guess I need to figure out what new skill (or improved skill) will help me most in making the transition to a higher level as a doubles player. Options include: 1. More action on the slice serve, and a better topspin serve. I do not hit a flat serve because I cannot generate enough pace to bother anyone. 2. Heavier FH. I hit a topspin FH, but I really would love a ball that dives right before it hits the baseline. 3. Slice groundstrokes. My BH slice floats and lacks directional control. My FH slice is great when I hit it well, but I can't aim it. 4. Heavier and more accurate volleys, especially approach volleys. Any thoughts? I do prefer to focus on one thing at a time rather than trying to do many things at once in a lesson. This is especially since it gets hard to practice what is learned once winter gets here.