Jesus was not the new covenant. He was the mediator of the new covenant. That's what God says, so the issue is settled. if you chose to believe a myth over the clear teaching of Holy Scripture then I can't help you.
Jesus is the Word (John 1) and the Ark contained the word of the Old Testament also.
What part of "My blood of the covenant" says mediator?
New International Version
Matthew 26:26-28
26While they were eating, Jesus took bread, gave thanks and broke it, and gave it to his disciples, saying, "Take and eat; this is my body." 27Then he took the cup, gave thanks and offered it to them, saying, "Drink from it, all of you. 28This is my blood of the covenant, which is poured out for many for the forgiveness of sins.
Mark 14:22-24
22While they were eating, Jesus took bread, gave thanks and broke it, and gave it to his disciples, saying, "Take it; this is my body." 23Then he took the cup, gave thanks and offered it to them, and they all drank from it. 24"This is my blood of the covenant, which is poured out for many," he said to them.
Luke 22:19-20
19And he took bread, gave thanks and broke it, and gave it to them, saying, "This is my body given for you; do this in remembrance of me." 20In the same way, after the supper he took the cup, saying, "This cup is the new covenant in my blood, which is poured out for you.
KJV:Luke22:20Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
YLT:20In like manner, also, the cup after the supping, saying, `This cup [is] the new covenant in my blood, that for you is being poured forth.
Jesus' Blood is the New Covenant. Maybe you think this makes Him only a "mediator."
SD