I put into practice all that is in the New Covenant - the Old Covenant is not mine.
The Law and the Prophets were a school master, a pedagogue pointing to Christ and His New Covenant with us.
"Now, therefore, why are you putting God to the test by placing a yoke on the neck of the disciples that neither our fathers nor we have been able to bear?" Acts 15:10
I will not wear the yoke of the Law, and the requirements thereof - for it was not purposed for the Gentile to do so. Legalism is harmful to spiritual growth. In many of these passages that you point out, the Lord is addressing the HOUSE OF ISRAEL.
That said, I value the OT, it's foundational and supportive; the stories have morality and have many lessons within. Sin hasn't changed, the perspective of how we deal with the burden has. It is God's Word, it is profitable, but not all of it is applicable in my life.
Genesis is most important - the beginning, Our origins. The Stories of the Flood, of Moses, Abraham, Joseph, Daniel, Job are all invalueable. Proverbs has wisdom; with Psalms we praise and worship. The Prophets delivered valuable messages, warnings and rebukes for their lives and future and some for ours as well, they proved these messages were from God. Certain instructions were specifically for His chosen people. Not all of it is for us. How is Deuteronomy or Leviticus applicable to the Christian walk? Do you practice 624 laws and repenting each one?
I know that churches that spend too much time studying the Law become legalistic. Be careful with that yoke.