Stronghold series, especially Stronghold Crusader. You get to build and manage your own stronghold, which is like a mini - kingdom. You have to worry about food production, military defense, and the well - being of your peasants. Another is Tropico. Here, you are the dictator (in a somewhat comical way) of a tropical island nation. You build infrastructure, manage the economy, and keep your citizens happy, all of which are key elements in kingdom - building games. Lastly, Cities: Skylines can also be considered. Although it's mainly focused on building a modern city, the concepts of resource management, zoning, and expansion are similar to those in a kingdom - building game.
Anno 1800 is a good choice. It allows you to build and develop your own island - based empire. You have to manage resources, build infrastructure, and trade with other islands, much like in a kingdom - building game. Planet Coaster is also relevant. While it's mainly about building amusement parks, it has similar concepts of construction, management, and attracting 'visitors' (in this case, park - goers), which can be related to attracting settlers in a kingdom - building game. Then there's RimWorld. It's more about colonizing a planet, but you build up your base, manage your colonists, and face various challenges, just like in a kingdom - building scenario.