The game is really good and has a lot of potential for growth — but you already know that better than I do.
I would suggest adding a multiplayer mode with a maximum of 2 to 4 players, featuring a significantly larger map where players can interact with each other as village leaders (or not), engaging in trading activities and in general or random missions with gradually increasing difficulty.
Of course, I’m not aware of the possible building or server limits, but I trust that you are capable of handling that.