Honestly, I would say that re-examining the things that make Advance Wars fun and seeing if you could make a turn based, strategic sort of game with similar sort of feel, only without the "war" part. Wargroove already exists as an "advance wars clone" so trying to recreate the core fun of the game without the emphasis on war could be a pretty interesting and unique experience. It is hard to do, as so many games are just focused on violence that it can be hard to create a game with conflict without it, but I think there is an ever increasing group of people who would like to play games that have fun strategy gameplay, but in a non-violent context.