The OT scriptures are not in any way “mysterious.”
Just read them and learn.
Look at the 2nd amendment: A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed.
Simple and right to the point. A simple truth can be put that way, and no one needs to go sorting through 300 pages of songs, stories, and speeches to get to it. It's straight up. It doesn't have to be gussied up to sound like Gandalf crossed with Peter Singer.
Just try it. Pick one of the four things I asked you to explain:
1. How does Jesus' life fulfill anything laid down at Sinai?
2. How does Jesus' life fulfill the prophecy of the Passover?
3. How does Jesus' life fulfill the prophecy of the First Fruits?
4. How does Jesus' life fulfill the prophecy of the Pentecost?
Just pick one. Tell me the prophecy in simple language and how he fulfilled it. If it's true, it doesn't take a wall of flowery text and an afternoon of study to figure it out. This isn't some warlock's code, right?