That's what Revelation is all about. It's how Jesus fulfils all of God's promises in the Old Testament. Then make a real effort to know and understand the Old Testament. Read the whole Bible as God's progressive increasing revelation of Himself, which ends in Christ. Revelation is an unveiling of the Old Testament, and when read as such, its meaning becomes much clearer.
Revelation is also like the conclusion to an essay or a documentary.
A conclusion doesn't contain new material. Revelation is in a sense the book we could do without, because it is a summary of the New Testament. What is new is the style in which it is written. It's like having a newspaper article with a cartoon that goes with it. You could do without the cartoon, it says the same thing, but it says it in a different way, and your appreciation of the article is enhanced by it.