You know, I'm always a bit skeptical of those 'Harry finds out early' plots. Half the time they're just power fantasies where an eleven-year-old suddenly acts like a seasoned wizard politician, which just breaks my suspension of disbelief completely. The ones that work for me are the ones where the discovery itself is messy and has consequences. Like, accidental magic going haywire because he's emotional and untrained, attracting the wrong kind of attention from the Ministry or even Death Eater sympathizers in the neighborhood. That creates a different kind of tension before Hogwarts even starts.
Instead of a wide-eyed kid on the train, you get someone already wary, maybe even a little jaded, who sees Hogwarts less as a wonderland and more as a potential safe harbor—or another set of rules to navigate. It can really shift his relationships, too. He might cling harder to Ron and Hermione as his first real anchors, or conversely, be so guarded he pushes people away initially. The whole dynamic with Dumbledore changes from blind trust to a much more complicated negotiation from day one. I remember one story where he'd been secretly practicing simple charms from a stolen textbook in his cupboard, and his first encounter with Flitwick was this brilliant mix of relief and panic that he'd be in trouble.