GoldFinger
i believ you wrote this fic cause you enjoy writing it, so if you didnt enjoy the last two chapters then rewrite them however you like, and if you want my opinion then i think you can write another idea that can make him blend in, rather than fooling them into believing that he is a prophet also the gun, i think the mc has only one way to explain it,is to tell them its somekind of magic , however till now i really enjoyed the story ✌️
Prologue probably did it for most people, I myself dropped it bc it was super long. Only re-read because I was super bored. I haven't watched much of GoT but it was a medieval political series with some magic elements. I didn't really think it was the best place for the main character to start off in, but I guess it's the place where he uses his intelligence the most rather then blowing stuff up. Also this is WN, I doubt people appreciate having the MC being questioned a lot and being looked down upon. It felt like a play, that could blow up in his face later. I don't think you need to re-write anything but just have MC rely less on his meta knowledge to trick other people.
Dude, reread the chapters, if you like it and see that it's progressing as you imagined, don't rewrite. If you Rewrite just because your readers don't like it, you won't like the story any more in the future, because you'll feel like it's not your story anymore. that's not your job just going to be writing what readers want.
I don't know enough about game of thrones to say one way or another but it seemed like a bit of a bump but not a major downside to the plot. He could have definitely leveraged the information he had by acting more mysterious and prophesy-like until within closed doors then reveal he knows more than he should in front of his kids who he can't just have killed.