If you want to hold steady on the target, you have to practice holding steady on the target without other distractions such as a target.
Draw, settle into a good relaxed anchor, hold for a few seconds then LET DOWN.
Do NOT release the arrow.
Do this until you can hold on the target with only a normal range of motion. Note that you should accept some movement. Only a few can hold without movement and curiously they don't always beat the guys that have a little range of motion.
Next step is to go to a blank bale and develop a smooth and even release execution. You want to execute with absolutely no hesitation from the time that you begin release execution to your follow through. Smooth & even is the goal.
The third step is to integrate these two close up on a large target. Then gradually work back.
Hope this helps,
Allen