From what I understand of the population system, you can only buy the next kingdom prestige level if your global population is high enough (the right column), which means your other kingdoms are a high enough prestige level.
And leveling up a kingdom is how you raise that global population. Each level gives a set amount of population (the middle column)
To level a kingdom up to level 50, for example, you need 1 million global population. We have 37 kingdoms. So, removing the one currently at level 49, the other 36 need to provide about 26,389 each. That means you need them to be about level 42 and 43. If they’re at that level, you can upgrade the level 49 to level 50 (with the right amount of xp/crystals). If not you can’t.
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