Change Keeper's spawn spot after conceding goal.
After conceding a goal, the player in the keeper position should not be placed as the recipient of the ball on the next kick-off. Too often we see players lose their cool after conceding a goal, due to either the frustration of game mechanics or being unfairly ridiculed by teammates, leading to a "tilt" situation where the player either recklessly loses the ball after receiving it from kick-off, or worse, turning and shooting it back into their own net.
The keeper should be rotated out to one of the three other positions instead. It's not to say other players wouldn't do this, too, but the goalkeeper position is a higher stress position and winds players up more often than mistakes elsewhere on the pitch.