Practice getting the setter to see what is going on the other side of the net.
Set up if then setting, for example is the blocker moves to their left, set back.
1. Player feeds ball to the setter.
2. Middle Blocker either moves in a direction or stays in the same spot.
3. Setter sets to specified place based on the movement of the blocker.
Have setter transition from back row during a toss, you should make the toss higher.