I think the Old Testament is a narrative about man’s inability to follow God’s laws. After a period of exile or slavery (loss of their lands) Israel would repent and live according to God’s laws for a while, then a new ruler would begin to commit sin and the people would follow him.
The whole of the Bible is about our need for a perfect Savior.
Thanks for insights about the difference in OT and NT. I have a long way to go.