Israel's national blessings in every realm, and God's Presence in their midst, are linked to fulfillment of God's Torah. L.A. A small broken remnent will survive exile and regret their leaving God. Then He'll remember His patriarchal covenants and the Land, which celebrated its Sabbatical years, while desolate. God will never abandon His Exodus and Sinai Covenants with Israel. Animals cannot be redeemed, unless unfit for sacrifice.
Animal tithes are random and unredeemable.
So we finish Leviticus.