Good line-up, steer each other, when the service is difficult look for a solution together, when the service is difficult play the ball high so that others can do something with it more easily.
Clearly call out "loosen up" or "I do".
Play aggressively, also in the rally, in case of a difficult ball, play the ball high so that others can do something with it more easily.
2nd or 3rd ball aggressively over the net, far into the backfield.
Move to the back of the court, in case of easy ball, 2 and 4, to help process easy ball, and/or are ready for a pass.
When the other team is attacking well, the midfielders join in to block (if the player is small, move to the back), position 6 defends the block.
Concentration, courage, work on/return every ball (let the opponent make the mistake). Aggressive means playing full, do not hold back,