I don't know if I'm missing something but it doesn't seem like there was anything solid that bran achieved or did after becoming the three eyed raven. The only big thing he did was reveal that Jon is Aegon Targaryen, which is something the makers could have easily shared with the audience by showing that Samwell read about it in the Citadel library. There is no way Bran went on this journey just for that one reveal right?

He didn't even play a role in killing the Night King and somehow still managed to become the main character 😭.

And what was the purpose of the old Three Eyed Raven? He just showed bran moments of the past which don't have a lot of value when it comes to the plot. Just some emotional moments such as the Hodor scene.

Anyway, maybe this is explained better in the books? Please tell me what his purpose was?