Fitness update: Need goals

I started seriously working out a few years ago, after the motorcycle accident that detached my acromioclavicular joint: The choice was hardcore physical therapy that transitions into a lifetime of keeping my shoulders and back strong, or surgery with a 33% chance of resulting in reduced mobility after three months of immobilization.

That was an easy choice.

So I worked on developing all the muscles across my back and shoulders necessary to keeping everything aligned and healthy, which in time resulted in the pleasant side-effect of getting stronger and more fit overall. So I've continued working out ever since, including CrossFit training at the Lawrence box plus setting up my home for daily workouts: heavy bag, pull-up bar, TRX device, free weights, weight vest, and so on. Except for when I'm buried in the CSSF Science Fiction Summer or otherwise on deadline, I've maintained a regular workout schedule, at least doing what I call "maintenance workouts" several times per week (single sets, basically).

But I find I lack motivation to go beyond maintenance! I want to continue to develop my body, continue to grow stronger and more muscular, and for me to achieve that requires that I set goals.

But what goals?

Aiming for a certain weight or reps does nothing for me, and I'm not shooting for any record. I can already lift anything I need to, such as heavy car parts. I can already do more push-ups or pull-ups or so forth than most of my buddies (those are always fun challenges). I'm not going to go back to martial-arts tournaments, because the really good participants are often much more ego-invested than is healthy (for their opponents). I've done a good job keeping off excess fat, and eating well is reward in itself.

Suggestions? What motivates you that I might try to keep improving my body?

Thanks,
Chris