Persepolis absolutely DOES use the “hero’s journey” narrative archetype you’re claiming it avoids. The second part even ends by explicitly stating that she has grown into a different person, and is now ready to “face the world” when she leaves her family for the second time.

Indeed, the story is quite Western overall, which is perhaps unsurprising, given that the author had already been living in the West for over a decade when she wrote it.