Bungee personally I like your game. That said it gets repetitive fairly fast. Many people have been suggesting ways to fix it, but they all cost a ton of money. So my suggestion is to have a few competitions where players design new maps. Let's say the best ten get implemented. Five PvE and five PvP. Then host a second competition where players design the best story mode missions for them. Think about it Bungee you'd have to do some sorting through and decide chest/enemy locations and spawn rates, but that's about it. Plus if players make these new story missions they'll get what they want!
Sincerely,
The_Chocolate_Ax