Why don't you have summer internships?
I think you guys (Travain Team) needs some engagement from new talents, university students who love playing this game.
Some students might introduce a new drawings of a paladin, a new way of thinking on the tribes, clever bots that could play the game, etc.
I feel you guys are happy with your achievements and not trying to develop something new and cool. Summer internships and new collegues
might give you a wider look, and present what unused possibilities you have with this game.
On the other hand, I like that finally you bring two new tribes onto the stage. I think the statistics of the units should be reconsidered,
but I guess you've already defined some goals about them and your designers tried their best to fit to the idea.