LazyCaveman
hmmm, you know Harry Potter FF are the perfect way to improve writing because you can use each school year as a clutch, you start without changing the plot too much and each year you can start implementing more and more stuff until the 7th year the plot is completely different. You just need to know from the start how powerful your mc is going to be at the end of each year so you don't end up with crazy power scale. But this is just my opinion, hope it helps with the rewrite, either way you do you OwO
if i may give a suggestion, don't make it too anime-ish (if you know what i mean).As for the GOT, you can make it an OC (i personally prefer that he was from Brandon and Ashara, a Stark build with Dayne appearance. You can make it that ancestor in house Dayne married to someone from house Targaryen to explain his ability to ride dragon, an ability to have a old magic from the blood of the first men, and a great aptitude in combat thanks to the blood of house Dayne), not reincarnated, just a gifted(in combat, intelligence etc.) and magical child. who by the time he reached his goal and met his end, he got reincarnated in our world.In our world, he found a book that sounds exactly like his original world, and enjoy his life to the fullest, such as enjoying his childhood, college, having a family, etc. Basiccally in the GOT, he learned about destiny and something like that, and in our world, he learned how to enjoy life.by the time he met his end in our world, he then reincarnated in the world of Harry Potter. but the difference is, in this world, every time he died. He still reincarnated in the same world. where he make a house of himself just like in the GOT (i mean ...you can even mentioned that one time. his house is the rule of the Roman Empire), who has a motto/word and sigil. Teach his descendant to not only be capable, but the concept of good and happiness.
In my opinion would go with the Stark route with OC being Robb Stark's older brother not only will there be more options on how to go about the story but there be more chances to develope the characters from the North and the Stark family then what was showed in the show be able to dive in a bit into the characters development