How can I help my grade schooler find his passion?
At this age, your child's job is to acquire many kinds of skills. The fact that you encourage your child to find something to be "passionate" about suggests that you might be applying excessive pressure to find a single thing he loves to do. Because he doesn't feel that way, he may be acting very self-contained and resisting all of your suggestions. You might be smothering him with parental concern.
Many kids in this stage of development need unstructured time to explore interests of their own. Encourage him to try things. Give him lots and lots of positive strokes for learning all kinds of skills. Learn about his interests, abilities and strengths, but make sure that they are unique to him and aren't what you think they should be.