Jesus already changed the Law by fulfilling it - Romans 10:4 as found at Matt. 5:17.
Ignoring Romans...Making a religious claim based on what Paul says, is like telling someone to wash based on what the elders say.
17 “Do not think I came to destroy the Law or the Prophets. I came, not to destroy, but to fulfill. 18 Truly I say to you that sooner would heaven and earth pass away than for one smallest letter or one stroke of a letter to pass away from the Law until all things take place. 19 Whoever, therefore, breaks one of these least commandments and teaches others to do so will be called least in relation to the Kingdom of the heavens. But whoever does them and teaches them will be called great in relation to the Kingdom of the heavens. 20 For I say to you that if your righteousness does not surpass that of the scribes and the Pharisees,+ you will by no means enter into the Kingdom of the heavens.
"until all things take place" - When there is peace on earth, then, maybe we can start to talk about changing the law. Until then...
"Whoever breaks one of these least commandments and teaches others to do so will be called least. Whoever does them and teaches them will be called great." - The entire law is in effect, from the least commandment ( Deuteronomy 22:6 ) to the greatest commandment ( Deuteronomy 6:5 ). Jesus rebukes anyone who teaches breaking any of them.
"if your righteousness does not surpass that of the scribes and the Pharisees, you will by no means enter into the Kingdom of the heavens." - Righteousness requires knowing. Righetousness is a choice. No one is accidentally righteous. A righteous person sees what is right, sees what is wrong, and chooses to do what is right in spite of whatever obstacles there are. The only way to surpass the righteousness of the pharisees and the scribes is to know what they knew, to understand why they did it, and to have the wisdom to apply it in today's world. That takes practice. The law of Moses must be practiced in order to be more righteous than the pharisees and the scribes.
Only Jesus, Not us, could fulfill or keep the Law - John 8:46
You are correct in this way. If you are not Jewish, you cannot fulfill or keep the law. If I have two children, and I ask the younger one to clean their room before playing outside. The older one cannot fulfill that rule. Even if the room gets cleaned. The rule was given to the younger child to teach them. The older child probably knows how to keep tidy. If the older child cleans the younger child's room, the younger child never learns to keep tidy. Yes, the room is clean, but, that wasn't the point. The rule is given to the younger child for a reason. Even if the older child doesn't understand the reason, that doesn't matter. the older child cannot fulfill or keep the rule because it was not given to them.
Now, if you're actually Jewish, and the law was given to you and me, let's see what John 8:46 has to say:
"Who of you convicts me of sin? If I speak truth, why is it that you do not believe me?"
Is this the verse you intended to cite? I read the entire chapter and no where does it say or imply "Only Jesus, Not us, could fulfill or keep the Law". However it does say:
"The one who is from God listens to the sayings of God." IOW, anything from Paul needs to be a direct quote of something holy. Paul's loopholes are not permissible.
Jesus did Not teach to keep seeking the Law, but rather now to seek God's kingdom ( thy kingdom come.... ) - Matt. 6:32-33
Interesting, let's see if Matthew 6 contradicts Matthew 5. I doubt it.
OH! This is the end of the speech began in Matthew 5. Jesus already told us ( at least me ) to keep the law. Let's put these two together.
Whoever, therefore, breaks one of these least commandments and teaches others to do so will be called least in relation to the Kingdom of the heavens. But whoever does them and teaches them will be called great in relation to the Kingdom of the heavens. 20 For I say to you that if your righteousness does not surpass that of the scribes and the Pharisees,+ you will by no means enter into the Kingdom of the heavens.
32 For all these are the things the nations are eagerly pursuing. Your heavenly Father knows that you need all these things. 33 “Keep on, then, seeking first the Kingdom and his righteousness, and all these other things will be added to you.+ 34 So never be anxious about the next day,+ for the next day will have its own anxieties. Each day has enough of its own troubles.
You said, "rather now to seek God's kingdom". You left out righteousness. The verse says "the Kingdom and his righteousness". And His Righteousness. Righteousness is required. That means the law is required. Knowing the law, understanding the pharisees and the scribes, and having the wisdom to apply it surpassing them is required. That takes practice.
As the Law had regulations so does God's kingdom but in the hands of Christ Jesus - Daniel 2:44-45; Daniel chapter 7:13-14,27
OK, Daniel... love it...
44 “In the days of those kings the God of heaven will set up a kingdom that will never be destroyed. And this kingdom will not be passed on to any other people. It will crush and put an end to all these kingdoms, and it alone will stand forever, 45 just as you saw that out of the mountain a stone was cut not by hands, and that it crushed the iron, the copper, the clay, the silver, and the gold. The Grand God has made known to the king what will happen in the future. The dream is true, and its interpretation is trustworthy.”
This ^^ hasn't happened yet. All the kingdoms have not been crushed.
13 “I kept watching in the visions of the night, and look! with the clouds of the heavens, someone like a son of man+ was coming; and he gained access to the Ancient of Days,+ and they brought him up close before that One. 14 And to him there were given rulership,+ honor,+ and a kingdom, that the peoples, nations, and language groups should all serve him.+ His rulership is an everlasting rulership that will not pass away, and his kingdom will not be destroyed.+ “‘And the kingdom and the rulership and the grandeur of the kingdoms under all the heavens were given to the people who are the holy ones of the Supreme One.+ Their kingdom is an everlasting kingdom,+ and all rulerships will serve and obey them.’
Also this ^^ hasn't happened yet. All rulerships are not serving and are not obeying.
So, whatever it is you think is in Christ Jesus' hands, it's in the future. It's not now.
Paul changed none of what Jesus put in place. - John 13:34-35; 1st Peter 2:16-17
Ignoring Peter... ( making a religious claim based on Peter is like asking me to wash based on the elders )
34 I am giving you a new commandment, that you love one another; just as I have loved you,+ you also love one another.+ 35 By this all will know that you are my disciples—if you have love among yourselves.”
OK... so what? Jesus is speaking to his disciples. Nothing here is saying anything about the law of Moses. Certainly Paul's loopholes aren't being condoned.