The Old Testament is one story, not many
Most people treat the Old Testament like a collection of isolated tales: Adam and Eve, Noah's ark, Moses parting the sea, David fighting Goliath. But read it as a whole and a single plotline emerges.
God creates a good world. People wreck it by choosing themselves over Him. Instead of walking away, God picks one family — Abraham's — to begin repairing the damage. That family becomes Israel, a nation meant to show the world what God is like.
Israel fails. A lot. Kings, prophets, priests, and ordinary people all miss the mark. But through every failure, God keeps making the same promise: a rescuer is coming. The Hebrew word is Messiah. The Old Testament ends with that promise still hanging in the air.