If the score is 6-0, 10 minutes into a game - you are on the edge of already blowing it.
So many easy ways to keep the score down.
1. Left footed shots
2. Left footed touches
3. Only x number of players in attacking half of field
4. Instead of shooting, pass ball to GK
5. Don't press
6. x number of passes then kick ball to opposing GK
So many other things to do which allow the score to remain reasonable, other team to touch the ball and your team to get "some" work. Playing keep away for 55 minutes is bad too. Two teams having to face each other that are completely different in talent levels is a tough situation. Realizing the situation quickly, communicating a remedy to your players all while not making it too obvious (verbally) to the other team is tricky.
I had to sub for our BU9 coach because the head coach couldn't make it to the game. We were up 6-0 at halftime, so I sat the 2 best players the whole second half and reversed everyone's playing positions, with a new keeper every few minutes. That meant that a defender who had not taken a shot all year took advantage of his opportunity and scored 4 straight goals. The real coach then had to listen the next week to our 4-goal hero's dad who wanted to get him moved to forward.