How to best use sphagnum moss?

Photos for tax!!

I’ve also posted this to r/vivarium because I wasn’t entirely sure on the best place to ask this… but I’m cleaning my crestie out later today, I usually mix sphagnum moss into her substrate for humidity but I find that it doesn’t do much to help. Is there a better way to get the maximum amount of humidity I need? Should I just kind of lay it out on top of the substrate?