In pairs, one player feeds the ball for the other player to make an approach and catch the ball. The feeding player varies where they feed the ball according to how competent the player is. The working player should always get around the ball so that the ball is between the feeder and the working player.
New hitters rarely miss because of their arm. They miss because of their feet. Build a reliable approach, then time it with your setter.
When your hitter gets stuffed, five teammates standing and watching is how you lose the point. Good attack coverage turns a blocked ball into a second swing.
Coaches spend hours correcting arms in serve receive when the real fault is almost always the feet. Fix the movement and the platform fixes itself.