How Does Memory Loss Affect The Player Returns After 10000 Years Plot?

Most setups with a character returning after an eon like that play the world-changing aspects pretty straight. You've got the obvious stuff: languages evolved beyond recognition, societies collapsed and risen again into something alien, technology or magic has either regressed to a dark age or advanced so far it's indistinguishable from sorcery. The landscape itself might be unrecognizable. But what I find more interesting is when the narrative twists the expected 'fish out of water' trope. What if the returning player finds their ancient, world-shaping deeds were completely misremembered? That they're not a legendary hero returned but a forgotten footnote, and the monuments they thought were for them commemorate someone else entirely. That kind of psychological shift, from expecting reverence to confronting absolute irrelevance, can be more brutal than any physical change to the map. It forces the character to rebuild their identity without the crutch of past glory, which ends up reshaping the story's internal world more than the external one. I recently read a web serial that did something clever with this. The returning 'player' found the world had essentially gamified his ancient, vague prophecies. His offhand comments from millennia ago had been codified into rigid religious dogma and bastardized into game-like quest systems by civilizations trying to appease the 'ancient one.' He wasn't returning to a world that changed independently; he was returning to a world that had built itself in a distorted reflection of his own past actions, turning him into a prisoner of a legacy he never intended to create. That exploration of myth-making and unintended consequences felt fresher than another tale of rediscovering lost magic.