I would think the challenge would evolve into making a program more efficient. RAM usage is out of control these days its ridiculous. Using more and different commands and features of a language. A comparison would be that you've ran a mile, a 5k, 10k, Half and Full Marathons. You've done them all. Now run them with better times which requires the body to be more efficient.
Or to ease the boredom it may require a project on your own of some sort if its more than just a job but carries over as a hobby as well.