Honestly, I don't think you can go wrong starting from 'The Sorcerer's Stone' and reading them as they were published. That's the order that built the world for all of us as kids, letting the complexity and darkness grow naturally with Harry's age. The first book is a lighter, more self-contained mystery that introduces the world without being overwhelming—it's a safe, welcoming entry point. Jumping around or starting with a later book like 'Prisoner of Azkaban', which is amazing, might mean missing crucial character introductions and world-building that make the payoffs richer. I've seen a few people try to read them in chronological order of the events within the wizarding world, like starting with 'Fantastic Beasts' or something, and it just feels messy and disconnected from the core emotional journey.
Stick with publication order. It's the path Rowling laid out, and the way the themes mature from a child's adventure into a full-blown war against evil feels so earned. The shift in tone after 'Goblet of Fire' hits way harder when you've grown alongside the characters for four books. I tried rereading 'Half-Blood Prince' first once, and all the subtle nods to earlier plots just flew right over my head.