I know this is not likely but what you could be experiencing with your dressing is what I'll call "normalisation".
The longer you dress, the more often you dress, then that thrill, that little bit of adrenalin rush subsides. For me dressing has become largely just like any GG dressing, this is what I wear when circumstances permit.
I sleep in a chemise most nights. There's no excitement to it, it's what I sleep in. If for instance we go on holiday and I need to sleep in drab stuff, upon my return there's no longer any great feeling of excitement when once again putting on my femme sleepwear.
It's a bit like for many of us who dressed through puberty, there was often a sexual element accompanying our dressing that might have expressed itself as self pleasuring at the end. This subsides for most of us. We normalise dressing into our lives. Excitement is exchanged for comfortable, comfortable in who we are.