One of the crucial strategies used by Karasuno to defeat Shiratorizawa was their adaptability and flexibility in changing their game plan based on the opponents' strengths and weaknesses. They focused on exploiting Shiratorizawa's weaknesses, such as targeting specific players or adjusting their blocking and defense strategies. Additionally, Karasuno's resilience and teamwork played a significant role in their victory, as they relied on each player's strengths and supported each other throughout the match. Their determination and never-give-up attitude also helped them overcome the challenges posed by Shiratorizawa's powerful players and strategies.