That's already significantly better. In the first version my eye kept reading the lowest parts as floating above everything else; in this revision it's much clearer.

In your Bevel, try changing the blending mode of the highlights from Screen to Overlay. The latter is a bit softer and less plastic-y.

In your outer glow, try changing the Technique setting from Softer to Precise. Either one works, honestly, but I find the latter gives slightly better control over how the glow falls.

And yes, conveying depth from a top-down perspective is difficult. I still struggle with it after several years working at this. The best advice I can give is to keep your light sources in mind -- depth is largely a product of shadow and highlight. In the absence of those, any scene will be flat.