Drill 4 - Servers take it in turns to serve line (outside servers) and cross court (inside servers) (If there are insufficient players just use 2 servers who will just serve to their group);
Pass to one of the two players facing the net;
Players call for ball and one passes to player with back to the net;
Player at net rolls ball back to server.
Rotate all players.
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.