Revisiting Books as an Adult

I want to revisit the books now as an adult after playing Hogwarts Legacy and totally falling in love with the HP world again. I’m unsure where to start as the last time I read them (I was 11 y/o, so 10 years ago) I found the first two books a bit silly/childish. I want to pick up on the deeper darker things in the story that I would have missed before. If anybody has any advice I’d really appreciate it!