Work on problems that are problems. Picking important problems misses the trees for the forest; picking unimportant problems misses the forest for the trees. So

Work on problems that are problems. Picking important problems misses the trees for the forest; picking unimportant problems misses the forest for the trees. Some people are more effective tackling larger issues like racism. Some people are more effective tackling interesting questions like, "How do we scale a microtransaction payment system for a social game?" Some people are more effective at what they enjoy doing. Some people are more effective when doing something that feels meaningful. Work on a problem that (1) you feel you can solve, (2) you think is worth solving, and (3) will challenge you. That's important enough.