How about breaking away from the routine? The routine of 4-5 days of war every week. Why not have a one war week taken away and be replaced with a campaign week. Flare gives this week for its players to explore the game with a “Campaign Week”.
Give it a special tweak. For example diamond week ( to get diamonds for level completion). Likewise gold week, uber chest week, ideas can just pour in. It will also give a break from the routine war system.