It's frustrating when enthusiasm isn't shared, especially in tech. I've seen similar apathy, and honestly, forced "team spirit" rarely works. Maybe try gamification? Not in a cheesy way, but find ways to make the work intrinsically rewarding. Think challenges, leaderboards, maybe even integrate something like creating custom levels in Geometry Dash to express code creatively - a bit out there, but could spark interest! Focus on tangible benefits for them, not just the project.