For when we were in the flesh, the sinful passions which were aroused by the law were at work in our members to bear fruit to death. But now we have been delivered from the law, having died to what we were held by, so that we should serve in the newness of the Spirit and not in the oldness of the letter. (NKJV)
The Law (10 Commands and all the rest) aroused pain that was only quenched by sin. That’s what “sinful passions which were aroused by the law” means. Yahweh didn’t give rules to Israel to improve their behavior. He did it to expose their hearts.
Yahweh gave us His Spirit for several reasons, including His desire to improve our behavior. He also exposes our hearts, much more effectively than the rules could. He also gives us the strength to be righteous and represent Him among unbelievers.
Stop looking for good rules. Surrender to the Good Ruler. Seek His Kingdom and His righteousness and you will find all you need to live.