Create rewards and incentives. All games have rewards and incentives. In DAOs these are not only financial incentives, but also social, cultural, intellectual, and even spiritual incentives.

how can we expand our understanding of “gamification” in tokenomics and DAO design to include not merely pushing overly quantifiable, financialized objectives, but rather incentivizing more emergent, non-objective processes of search and creativity, especially in culture- and knowledge-based communities?

Intrinsic and extrinsic motivators both exist and need to be carefully balanced. There is a long tradition of open-source development, and adding financial rewards can derail a project. (See: there is yet to be a successful "token-powered Wikipedia")