Hey, you have practically the best karts available on Steam, and you're not using them. Maybe you could make a Party Animals World Tour. Add a map from every continent. From time to time, you could add maps from the countries where you have the largest community. It would be a nice nod to the community, and on the other hand, you're using the potential you already have. As for the money, you can always add it in the form of DLC and add new skins and maps from time to time.