All Christians can enjoy Jesus and the hope of the gospel in the Old Testament. I argue this in my book, Delighting in the Old Testament: Through Christ and for Christ (Wheaton, IL: Crossway, 2024). Here is a basic overview of the book:

Introduction: Ten Reasons the Old Testament Matters for Christians
Part 1––READING WELL: HOW JESUS HELPS CHRISTIANS INTERPRET THE OLD TESTAMENT
Part 2––SEEING WELL: HOW JESUS’S BIBLE TESTIFIES ABOUT HIM
Part 3––HOPING WELL: HOW JESUS SECURES EVERY DIVINE PROMISE
Part 4––LIVING WELL: HOW JESUS MAKES MOSES’S LAW MATTER
Conclusion: Tips for Delighting in the Old Testament

Here is a video and some blogs posts that overview parts of the book:

Alongside the book’s release, For the Church has posted summaries of each chapter. In this series, we explore how Jesus helps Christians read the Old Testament faithfully, see Jesus there with believing eyes, hope through Christ in Old Testament promises, and live wisely and uprightly by benefiting through Jesus’s fulfillment from Moses’s instructions. Here are the 15 abridgements:

Introduction: Ten Reasons the Old Testament Matters for Christians
1. New Testament Reflections on Grasping the Old Testament’s Message
2. Old Testament Reflections on Grasping the Old Testament’s Message
3. Christ as the Light and Lens for Reading the Old Testament Well
4. KINGDOM: The Story of God’s Glory in Christ
5. Treasuring Christ in All of Scripture
6. Jesus in Genesis: A Case Study
7. Should Christians Hope in Old Testament Promises?
8. The Christian’s Connection to Old Testament Promises
9. How to Hope in Old Testament Promises through Christ
10. The Christians’ Connection to Moses’s Law
11. Other Views on the Christian and
Old Testament Law
12. How Jesus Maintains Some Old Testament Laws
13. How Jesus Transforms or Annuls
Some Old Testament Law
Conclusion: Tips for Delighting in the Old Testament

The Old Testament is God’s gift to the Church, and through and for Christ we all can delight in it by God’s grace.

PDF Sample: Introduction and Chapter 1 from Delighting in the Old Testament.