In every game where you earn currency and there is ranks. I always like it if when the player prestiges, they get a certain percentage boost on earning currency. For example if a challenge gives you 10 credits, 1st prestige gives you 15 credits when beating it, 2nd prestige gives 20 credits. Also a prestige currency would be cool. For every extra rank past 10, when they prestige, they get that in gems, for example, if im rank 13 and i prestige i will get 3 of these prestige coins. Then you can add a Prestige Shop where they can buy coin boosts, little treasure chests they can open for loot, and other cool things. I believe these would be awesome to add if you do add prestiges.