My idea is to set up a volunteer experience program in schools, kind of like work experience but for volunteering, where kids get to choose where they want to spend their time (op shops, soup kitchens, that sort of thing). A lot of them would probably form connections in these placements that stick with them and keep them volunteering long-term. I reckon this is a solid way to get people into the habit of giving back while they're still young, since it's not always about having the right intentions, sometimes it's just about habit.