I think this game should end with a key. Anyone who makes it to the end can enter a new game based on Greek Mythology. Then you have a whole new game and a vast amount of new creatures, people, and gods to play with.
I would like it if you gave us two interconnected cities we could toggle between, move buildings between and share materials with. This having one city does not allow for me to be artistic and really set up the cities the way I would like to. It is more a matter of just throwing things anywhere. The subject matter would be more diverse and by having toggling cities there would be more land mass to play with and the challenge of planning for sister cities. There you could try out some new ideas, have contests on Elvenar to design new buildings, there could be an annual "Olympics" event, let us choose our own "toon" to represent us with the ability to change them up with gifts from the gods, potions from the gods to make our armies stronger, etc. Elvenar is a more cerebral game for people who can think several jumps ahead, by the time they finish Elvenar they are ready for something that allows them to stretch a bit. There are no more surprises. Everything has become the same thing just a different day. Time for you designers to stretch out a little too. It would start out small as the only people who could enter are those who completed Elvenar, but it would give added incentive to those who only occasionally play now, but this is good because it allows the designers time to evolve it with built-in beta testers, the first folks who get there can have a hand in how it grows. Go on quests with Hercules, and Odysseus and others for various gods.