To make a kingdom you not only need to do a lot of farming for gold (500k min 800k+ is ideal) to sustain you until you take over enough land to get decent passive income but you need lot of high rep with clans because you will need to recruit them into your kingdom to be able to compete with enemy kingdoms.
I can recommend “my little warband” “Xorberax legacy” “calradia factions enhanced (and its dependencies such as “calradia at war” Realistic battle mod+AI (remember swadian+vlandian rbm rebalance if you use this) You can increase taxes income but it might affect your prosperity. I think you can configure this.Next, make sure the city has appropriate workshops to match its input villages. You can keep these workshops to keep receiving the passive income, or you can sell them off if you have more profitable operations elsewhere. Finally, spend a season completing missions and squashing bandit parties.waiM. 816 437 503 529 174 602 439 87