What are their approaches to science, magic, religion and so on?
Are the beings in your world happy with their lot? Is the government reasonable?
How does society handle those against the norm or those who defect, like my Eileen did?
How does your society organize itself?
If it’s a magical world, do they use magic for everything or do they limit its use? If the latter, why? I use limitations on the grounds fairies etc want to save magical energy for more important magic. After all, food can be grown, baked etc, so why use magic for that, unless in a dire hurry? My Fairy Kingdom has also realized machines can be used for drudge work too, again saving magical energy for better things (like taking on the Witch!).
Could your world come to an end? If so, how? If magic is involved, can that be misused to damage the physical world it’s set in? In my novels, I’ve set up barren areas, made that way by having too much magic pounding them. This has a knock on effect in forcing populations to move away and into other areas, causing tensions between the different groups (the sprites are generally condemned for having an irresponsible attitude to sex and reproduction - they are at it like rabbits!).
I find asking myself questions like the ones above are a great way to generate story ideas.