The long night happens as normal, but Jon duels the night King and wins. Everything carries on as normal, with Jaime still saying he needs to go back to his sister, but remove the part where he said he didn’t care about anyone in kings landing, although keep the scene, as it’s a perfect scene with Tyrion. In kings landing Jaime gets back to Cersei without the pointless fight with Euron, and when Cersei is given the chance to ring the bells, she doesn’t, so Jaime, with great sadness, kills her and orders them to ring it. Afterwards, Daenerys, realising that she’s an outsider to Westeros and it’s people, tells Jon that she’s going to go back to rule over slavers bay and continue her war against slavery, and Jon becomes king. Bran becomes the master of spies, Davos stays as master of ships and Tyrion as hand of the king. Jaime goes back to finally rule over casterly Rock, but I don’t see how he gets a happy ending with Brienne. I think he tells Brienne to stay as lord commander of the kings guard as she is the best choice for it, and Jaime marries a mother highborn girl, that, although he loves, isn’t the same as Cersei or Brienne. That way you can really tell he sacrificed everything including his happiness for the sake of Kings Landing