Isn't the skill being a bit inconsistent? We know people don't always gain the occupations they are fit for. So it's less destiny and more affinity. Which means he has the affinity for being a good lord (which makes sense with his skills), but is "founder of a great kindom" really an occupation? Wouldn't a more generic "ruler" title make more sense? And if he knew his perfect occupation was a ruler type and not a combat type, why was he so determined to be an adventurer? In the first chapter it seemed like he was roped into it by the prince rather than a desire of his own. He is a prince's friend, I would have tried to leverage that at some point in the past to getting a fief somewhere. Here it was given to him against his will.
I'd like the story more if the MC had taken a more proactive approach towards attaining his destiny instead of it being forced on him by everyone else before he finally accepted it with little effort on his part.