I practiced "the hard stuff" at the range today - groups at 50 yards, offhand at 15 yards, with liberal doses of ball-and-dummy (because the range I shoot at has plywood stalls that make a .22 sound like a .454 Casull), and you know what? After working uphill for an hour and a half, I was much more satisfied when I left.
I think there may be a lesson here. Geoff Colvin's "Talent is Overrated" talks about "deliberate practice," which is both the only way to get really good and (being intrinsically satisfying) a 'multiplier' - a positive-feedback motivation loop.
So...keys to motivation:
1. Do hard stuff.
2. Do new stuff.
3. Do a lot of 1 and 2.
4. Dry Fire. Fucking loads of dry fire.