There a number of ways for you to do that. I don't think there is a "best way". Ideas are just ideas; everything will depend on how you execute them.
So let me try to brainstorm you. In Horizon:Zero Dawn, A.I. has destroyed everything and almost everyone, to the point that the remaining humans don't have a clue how the world was before, so they live tribal lives in the wilds--they use high-tech tools as if they were natural, and robots run around like animals. In Sara Genge's Shoes-to-run (Asimov's Science Fiction July 2009), we follow a tribal girl who dreams of being a boy. The twist is that the story takes place in a refugee camp around a fortified, cyberpunk-ish Paris. In Derrick Boden's Hustle (Escape Pod episode 721), the characters live in a gig economy.
Takeaway: in all these amazing and extremely succesful stories, the characters are who they are, despite the technology. The clown in your story will keep doing her job, but not under the same job system we live today. Your amazon warrior will keep having her beliefs and defending the temple, but maybe she will do that with a laser gun instead of a silex spear.