Some type of weekly club duel where competitive clubs face off would be cool. This could be a point-based system based on club members overall weekly elo gains, win percentage, completed challenge points, ect. Maybe clubs can gain / lose an elo score based on the weeks performance. The original point system is good and should stay (just like how we gain badges / level up individually) but adding a club elo / competitive division would create more incentive for competitive play amongst your player base.