The problem with multiple card revelations is that after the first two, the audience pretty much knows what to expect so they're unlikely to be surprised. They might be impressed by the first revelation, and the second one if it looks different and more impressive than the first. After that, though, they're just watching someone demonstrate the fact that the cards weren't really lost to begin with with and therefore they were a bit stupid to be impressed the first two times. So, there needs to be some theatre injected into the routine. Why should they care? What's the narrative here? What abilities are you using to find the cards that are intrinsically interesting? Why are these abilities intrinsically interesting? When you know the answers to these questions, it will help you structure your routine better.
Having said that, here are a couple of other thoughts:
1. What tricks are you performing before this routine? Anything in which a selection is lost in the deck and then found again is bound to reduce the impact of yet more revelations.
2. How convinced are the audience that the selections are actually lost? Can you, without breaking from your narrative structure, add any extra convincers ("accidentally" drop the deck on the floor, hand it out to be shuffled, blindfold yourself, etc.)?
3. Do your revelations build to a climax? The last revelation is the most important by far. Think about ways to build tension as much as possible. Maybe this particular technique is the most difficult, the one you're most worried about messing up, maybe you weren't planning on doing it because you don't always get it right but this is such an encouraging audience you thought you'd give it a go, etc.
