Another entire way to think about this is that you shouldn’t worry about this much. Quests work as very elaborate Keys ala TSOY, and it’s the player’s job (with your oversight and help and observation) to find keys they want to turn, a lot. You step in to help them create new keys/quests (which they should become excited about), but honestly, it is so much better if you barely even know what’s on their quest cards other than the title. You can’t possibly keep 4 quests x 4 players x 10 things per quest in mind. They hammer their keys to get XP on their own free will, and choose actions which will turn the keys.