Why are you trying to kill the ball?
One of the biggest mistakes that I see lower level* players shoot for, is the killshot. The killshot is bar none the hardest shot to hit in the game. Even at the Pro level you have a very slim chance to hit a killshot. A killshot is defined as a shot in which the ball bounces it second time before the short line. Given that the percentage to hit it goes down exponentially as you degrade in player ability, makes it crazy that most lower level players are trying to smack a winning killshot.
A much better approach would be to get back to basics. Instead of trying to hit the lowest percentage shot, start thinking about your options when you are hitting the ball. First start to think of it a bit like a strategy game. Take into account your, and your opponent's court position. Are you hitting the shot from a powerful position or a weak one? A powerful position is when you are centered between the side walls and forward of the encroachment line, yet behind the serving line. Your position gets weaker the further you move from this point. Is your opponent in a powerful or weak position?
Now that you've determined your positions, figure in your percentages to hit a successful shot. How fast is the ball traveling? The faster it is traveling the lower the percentage goes. Are my feet set? If you are on the run the percentage goes way down. Can I hit the shot below my knee? Anything above lowers the percentage of a great shot.
Lets run through a few simple scenarios:
You receive a setup (high). Is my opponent in the back of the court (weak)? Maybe a pinch. Which side are they on? If I can't hit a pinch then lets go for a pass to the opposite side of the court.
or
You receive a setup (high). Is my opponent in the front of the court (powerful)? Maybe I could hit a high pass around them? What about a wide pass to change things up?
or
You receive a ceiling ball. Am I hitting the shot above my waist (low)? Should I go to the ceiling or is it such a big setup and I am in a powerful position while my opponent is weak that I could hit a really high pass and get away with it?
In none of these scenarios should you be thinking "killshot". In fact you should dismis the killshot off to the fact of being a lucky shot or a fluke, because what you were trying to do was hit a great down the line pass and it went low. The first thing you should start to see is less skips. Skips are the biggest way to lose a match, and they are also much easier to hit when shooting for that bottom board. Raise your shots up a bit and it becomes much easier to not skip. Let your opponent skip the ball, don't just give it to them.
Racquetball Ninja's rule #1: Do everything in your power to not skip the ball.
The next thing you should see is more points for you. Now that you are hitting less skips, you are effectively putting more pressure on your opponent to to do the same. The other thing that is happening is that the ball, with proper passes, will be going behind your opponent.
Racquetball Ninja's rule #2: It is easier to move forward than backwards.
And the same is true for your opponent. If you are hitting the ball low, the ball will be up in the front of the court. A opponent can then move forward easier and if you leave the ball up enough will be low enough for them to attempt a re-kill which is ten fold easier. Why? Because they are in the front of the court in a powerful court position, while having the ball low enough (high) to effectively hit a shot within their roundhouse. I am a re-kill master, and I will eat your left up kill attempts for breakfast. I encourage you to become a re-kill master as well, after you learn to effectively pass.
With a pass you are forcing your opponent into a weaker position on the court while giving yourself the time to get into a powerful one. Makes it way easier to get the next shot and make a better return.
For each shot get into the practice of analysing these areas for your shot selections. Given time they will become second nature and you too shall have inner peace.