It would be nice to have a world map with slightly fewer provinces and maybe set in a modern scenario. It could also be cool to add the possibility of acting as a mediator between an ally and a country your ally is at war with, as well as managing statistics that can give advantages or disadvantages to a country, such as land and naval military strength, or troop movement speed for a country.
It might also be nice to add one more bomb, less powerful than the atomic bomb but easier to obtain, and above all it would be really great to have the possibility of carrying out air strikes on specific targets, whether they are resources or populated areas, and to add troops specialized in espionage, so you can know exactly what the other country has across its entire territory, such as troops, quantities of resources, weapons, and so on.