Request passage of time
This feature is often implemented in games under a name such as “expedition”. This is an element that rewards the quests by waiting for real time to elapse, rather than in-game success or failure.
By making it so that players are rewarded after 12 hours of starting a quest, a play cycle can be created in which players log in once a morning and once a night, or even once a day.
Since less effort is required to send a character on an expedition, it is easy to get people to play every day.