QH Welcomes the Antiquity Crafting System (ACS)
Reached level 3 last week. My progress is slow but palpable.
You could create artificial needs by setting challenges again. I seem to recall the challenges and trophies were successful in getting people to try new skills. It got me into blacksmithing and fishing, or one!
There's also bragging rights. If you manage to make something from scratch that was very difficult, we could take a picture and share it to the group, with a challenge for someone else to top it.
Like Louis Francis de Beauharnois said, achievements can be a motivation.
Just a bit of extemporaneous brainstorming.