How about we forget about player level its useless and show their power level above other player's heads.
Actually give us events and activities that require max light levels. Make us grind to get to max level... Iron banner, trials, nightfall, daily missions/quests at max level will help people WANT to get to max level.
Most of my clan quit because there is no reason to play past the main story line now that we have the platinum trophy.
Bring back record books to track us. Give us goals to get too, like the ornaments... But most of the armor ornaments look worse then the original armies. So make them look more different or cooler or styled as something.