For example you make commanders of soliders, and supply them weapons and armor, and give them tasks, you regularly are attacked by neighbors, dragons, trolls, you make scouts and all sorts of things.
The landscape should be basically trees, no ruins, your the first inhabitants of the land, should be very hostile, completly impossible to conquere all the lands.
For example you mine out a mountain, you put in some equipment down there, like smelter tech, you put in some wizard and alchemist tables, a barracks, an armory, on the bottom is a dungeon, maybe you stick a troll in a pit, and watch them devour enemies, maybe use spiders or other monsters.
You could become a bandit leader, could become a trader, a mercenary army, lead a wizard, vampire, alchemy, or mining/economic group.
The game would still be first person and do everything you do now, just control over others, and the enemies can come to you for once.
You could only attack based on people you had and troops you had, if your people are starving to death, freezing to death, being eaten by bears, wolfs and dragons, your people will die off and you will be alone and ultimately lose the game.
it could be done very easily, you just appoint people sub leaders, make 1 incharge of metal (encompasses running the forge and mining and refining metal) 1 in charge of construction, makes buildings, tables, chairs, forts. 1 in charge of magic, they can form a few magic units, they research magic, requre a libary of magic, the bigger and more information the better. and so on with other groups, things like inns, and market places, you dont need to control them.