These are all wrong.
Valyria v. Rhoynar is season 1….we learn about old Valyria and the Rhoynar…Season 2 is the war and the Rhoynar fleeing…Season 3 is the Rhoynar getting to Dorne, aligning with the Martell’s and conquering Dorne. If you want you can have the last season after Dorne is conquered being about the Doom of Valyria.
Then we do the North…how the Starks came to power could be a great 3 season arc. Battles with the Bolton’s…battles with the other houses… everyone likes the Starks…lets see how they became bad asses
Whose not watching those 7 seasons?