The MC destined occupation is telling us that this manga will take a looooooong time, hope it's not as long as that kid detective that probably won't be an adult even when I die in the future.
So MC is skill is Kingdom Founder from begining but as an ordinary child who dreams of becoming a hero and adventurer, and he formed the strongest adventurer party but it turned out that his fighting ability was stuck and far behind his friends.
and his friends are like "hey let's get the MC out of the party and give him the land so he can maximize his The Great Kingdom Founder's skills, and you know our quests now will be very dangerous for MC"
@jascaicps1 Yea, that was kinda odd cause Ch 2(?) showed him using his skill on himself.
But I think the manga is implying that he was probably in denial about what his talents are best suited for.
@PTRB Yes I think he did finally come to terms with the fact he can't be the type of adventurer he wanted to be. Though, as he said he hasn't given up on being a adventurer because being a lord a administering some land is its own adventure. Like he said, he has undertaken a quest like an adventurer to develop and make this land prosper. So he's still a adventurer at heart.