The Players' emotions
When I start to work on a new Project, my first priority is to understand the business objectives; afterwards the expected learning objectives and then the audience.
When I start the ideation about a potential gamified approach, I like to keep in mind the different Quick Reference Cards that I have previously published: the game typology, the gamification items, the player psychology.
I also pay attention to the players' emotions. I hope that this new QRC will help you to take your own decisions.
May the inspiration be with you.