They should learn from Bayern München fans, they are insane and give insane boost to the team with their cheering and shit. Just go watch latest Bayern match, and watch when Augsburg scores the first goal. The whole stadium just continue cheering/singing banging on the drums like nothing happened.
Don`t get me wrong when Juve have full stadium it can be insane too, but too many times have the stadium gone quiet when we face a tough challenge.