I've got a question for you. But first I need to set it up.
Though it clearly isn't the whole story, the major reason Christ died was as a sacrifice, atoning for our sins:
"The Son of Man did not come to be served, but to serve, and to give his life as a ransom for many" (Mark 10:45).So why did Jesus die at Passover instead of the Day of Atonement?
"Christ was sacrificed once to take away the sins of many people" (Heb 9:28).
"In Him we have redemption through His blood, the forgiveness of our trespasses" (Eph 1:7).
Or to put it another way, what is the significance of Christ's dying at Passover rather than the Day of Atonement?