In all the posts in the Scriptures you yourself quoted,
Jesus showed the disciples He is the promised Messiah,
but did not show the nation of Israel, not the other Jews,
which also is completely in harmony with all Scripture.
You have this very weird belief there. I think what you meant was that he only
specifically revealed to the 12 that he will die and be raised again on the 3rd day
But as for him preaching the Gospel of the Kingdom, I have already shown you Matthew 4:17.
But if that is not enough, let's use Luke 7
Jesus and John the Baptist
18 John’s disciples told him about all these things. Calling two of them, 19 he sent them to the Lord to ask, “Are you the one who is to come, or should we expect someone else?”
20 When the men came to Jesus, they said, “John the Baptist sent us to you to ask, ‘
Are you the one who is to come, or should we expect someone else?’”
21
At that very time Jesus cured many who had diseases, sicknesses and evil spirits, and gave sight to many who were blind. 22 So he replied to the messengers, “
Go back and report to John what you have seen and heard: The blind receive sight, the lame walk, those who have leprosy[a] are cleansed, the deaf hear, the dead are raised, and the good news is proclaimed to the poor. 23 Blessed is anyone who does not stumble on account of me.”
Notice something interesting in the above account. Jesus did not answer his disciples directly and immediately. He performed many miracles at the very same time when the question was uttered. Then he replied back to his disciples a passage from Isaiah 35:3-6
Strengthen the feeble hands, steady the knees that give way; say to those with fearful hearts, “Be strong, do not fear, your God will come, he will come with vengeance; with divine retribution he will come to save you.”
Then will the eyes of the blind be opened and the ears of the deaf unstopped. Then will the lame leap like a deer, and the mute tongue shout for joy
This passage was supposed to be a prophecy of the coming Messiah. Prior to Jesus on Earth, there was no one that was capable of performing all these miracles of curing blindness, deafness, dumbness and lameness.
Thus, healing the Jews from their physical disease is an important sign, to all of them who have memorized the OT, that their Messiah is here.