What is the best way to develop anticipation of the reveal of the perpetrator? I’m struggling a bit with this. I feel like my story as a whole is good but lacking when I get to the reveal. Any suggestions are greatly appreciated.
Hi, and welcome to the Community! 
Without giving away the whole idea, it would be cool to hear a bit more about the book—what’s the setting like? What kind of tension are you building toward?
For me, the sweet spot is when I feel like I had just enough clues to maybe figure it out—but not quite all of them. That “Ah, I should’ve seen it!” feeling.
Balancing where to drop those breadcrumbs and how much to reveal with foreshadowing is challenging, so maybe the trick is to draft plenty of scenes with clues in them, and then later pick out only the strongest moments to keep.
I’ve got a fun brainstorming idea for this! 
The Thinkboard has a template called “Crime Fiction” that’s full of open-ended questions and prompts about building tension. Even if your story isn’t strictly crime fiction, the elements—like plot devices and antagonist dynamics—are useful for any suspenseful story. 
If you fill in the template with your story ideas, I’m sure you’ll discover some new directions to explore!