There are a number of things to consider. Finding accomplishment in life is something many struggle with. Perhaps your friend would feel some accomplishment by: * Mentoring new startups * Mentoring disadvantaged youth * Religion * Community service/projects * Becoming involved in local government service * Horticulture * Woodwork/old car restoration/old computer restoration * Adopt an elderly neighbor as a "grandpare…
Religion: How is a faith system i.e. "pretending to know things that you don't know" going to help? Community is a good thing, sure. But how does faith help?
I'm not sure I would recommend religion to this person. But I wouldn't be surprised if his unhappiness comes from what he chooses to believe in some context.