Shalom.Do you know what God's law could not do (Ro8:3KJV), and that it could not bring life (Gal3:21KJV)?
I have read the entire Bible, and I accept it all. You may need help with understanding or interpretation. Have you started at the beginning with Torah? Then we have the Prophets and the Writings. The TaNaKh is before Matthew through Revelation.
Consider the following.
Deuteronomy 30:15, 19, 20
Deuteronomy 32:45-47
Romans 7:10
The scripture Romans 7:10 does not cancel out or invalidate anything that has come before. It has to do with how Paul was thinking and what he learned from the commandment, even in regard to Jesus Christ. See Romans 7:25.
Also, it is my belief that Matthew 5:17-20 is talking about more than just the Ten Commandments. The Torah has 613 commandments.
Shalom.
Jacob