#1: Being BFFs with the brightest witch of her age
The number one luckiest break Harry has? Being best friends with Hermione Granger. I know what people are gonna say. Harry was helped by so many characters! Ron, Dumbledore, Hagrid-- even Snape. You could write a list as long as your arm of characters that help Harry in such a meaningful way that it's hard to imagine him getting by without them. But Hermoine just outdoes them all in terms of consistency. Not only does she save his butt in every single book, but I think you would be hard-pressed to find consecutive chapters in any book in which she does not help our protagonist.
In another world, we could all be obsessed with the Hermoine Granger franchise, wherein we follow the adventures of a brilliant young women who helps a fortuitous, disfigured orphan defeat his lifelong abuser. Seriously, Harry’s luckiest break is to be the star of his own book series.