I haven't mastered it yet, but I opened the door to a new creative avenue. I added five duplicates of the first layer. I moved one to the top, one to the bottom, one on the right third, and a big one that covered the whole shot.
Here's the before and after of the edit. I didn't make it super bold, but there's a bit more of a vintage look on the after video.
In working on this tutorial, I'm reminded that many of the effects that we learn in After Effects aren't mastered in one tutorial. They must be applied to multiple projects before really getting a handle on them. Every project requires a different look and feel, which means that the effect will need to be tweaked. Knowing just how to tweak it requires a great deal of practice.