Another approach is to contrast. Present a sharp contrast in the story at the climax point. For instance, in a story about a poor but kind-hearted boy who suddenly receives a large inheritance but still remains true to his values. This kind of contrast can create a powerful emotional impact and serve as a great teaching climax.
One way is to build suspense. For example, if it's a mystery story, hold back key information until the right moment. This keeps the students' attention and makes them eager to know more.