Consider your own redemption. God always wanted to call us back to him, to live with him in eternal friendship.
We cannot separate the Immaculate Conception from the premise of our own Baptism. By our Baptism we are cleansed of our Original Sin. John the Baptist’s baptism was not our Christian Baptism. John’s baptism was an outward sign of an inner reality regarding the repentance of those who listened to John’s message. John called people to repentance, and the ancient cleansing baptism with water in the Jordan was the outward sign of their desire to be cleansed of their sins.
Jesus’ Baptism is a sacramental gift of life. Christian baptism gives life. By our baptism we are restored to eternal friendship, eternal life with God. By our baptism we become just like Mary. Mary was born without original sin. Mary did not sin. Mary could not die. When we are baptized we become like Mary, so we can share divine life with her in God.