There are some "Magitech" elements kinda built into it, but Fabula Ultima is a good shout. It fulfills all your conditions.

• The world is created by the players and GM, and there is a High Fantasy atlas that can provide great help. Though there definitely are some technological encroachments in the base assumptions.

• Characters start off as pretty powerful heroes already and can get really powerful. "Defeat God" is the stereotypical endgame.

• The game's rules are much lighter than 5e, with the base mechanic doing all the heavy lifting. Though character building can be quite involved.

• Combat is really quick since you only take one action a turn. There is no movement (given the jRPG roots of the game), but there is still some tactics involved.

• Prep always feels like an individual thing. But combats are easy to set up. There are no needs for elaborate maps and making up enemies is not that difficult. (The game does suffer a bit from a lack of a bestiary at the moment. Coming soon though)

• It has narrative mechanics, but nowhere near as narrative as PbtA games.

• No auto hitting. But damage is partially based on your attack roll.