Side quests: Things you want to accomplish, which have their own challenges, that are also tough.
The existing quests are one-offs. Side quests would lead you to your epic win, but have their own win. For example: I'm battling depression. My first epic win is to clean my room and do my laundry. I also want to quit smoking. Quitting smoking would help me connect to more people, and help with my sense of alienation and help me feel less depressed. Smoking however has it's own challenges (some related some not) and is a win in and of itself.