@givemersspls
Your problem is just that he does not explain what he will do in 5 or 10 years if he were king.
While in the end no explanation is asked him, which is normal he knows almost nothing about the situation of the country and these relations with the rest of the world, moreover the current king wanted to do the same thing, without really knowing how, but in a classic and slower way (through marriage), without risk for his country, for the rest he did not seem to have a plan.
If we look at it from our point of view, there is no point in knowing all in detail now, there would be no point in reading and especially the author would be obliged to create exceptional situations just to make interesting story.
While it's easier to stay vague and find solutions as you go
to have an interesting story and especially that sticks with the reality of the moment, it is normal not to have too much information.
otherwise we will have the impression that the main character knows all for no reason and that he will find a solution to stay on his plan of departure just because it is the perfect world he has in his head.
Everything will be too good to be true.
I understand what bothers you, but in the end too much detail would make the story ridiculous
it would be another story with a reincarnate man who will all be successful because the author is there
and it will be seen as the nose in the middle of the face.
the main character can not predict everything in advance, because he is not god, he has a goal and he will do is possible to reach it in a world that is very unstable