Stamper, Don't feel like the Lone Ranger. I've been doing photography as an art form for 60 years and periodically I fall into the kind of funk you're describing. I think at least two things are at work when that happens: (1) I'm covering the same ground I've covered many times before, and the freshness is gone, and (2) I've seen more and more good photographs by other photographers, so I'm judging my own work against an ever rising and more extensive standard.
But comparison with the work of others isn't as powerful a turnoff as comparison with my own work. I look at my own collections and sometimes feel I'm losing it. But then I remember that those collections represent what's left after extensive culling. If I really think about it I realize the percentage of keepers hasn't actually shrunk, which is not to say that's an encouraging thought.
I've said it before, but I'll say it again. I get so-so keepers practically every day, but if I average one picture a year upon which I'd stake my reputation, I'm doing well. I'd call your two to three percent pretty encouraging. I'd love to see more of your kind of critical self-analysis by posters on LuLa.