Tighten up the diet to get weight down.

Exercise. Any kind of exercise, from strength training to walking.

The diet-and-exercise cliche is a cliche because it effects just about everything about us. It may not be the only factor in snoring. Or even the dominant factor. But I'd bet the house it's a factor.

The approach that's worked for me: define the smallest useful version first, ship it, then iterate based on real feedback. Most people overbuild before they have any users.