(Total Beginner) What's the hype about The Great Gatsby?

I just finished the book. It was a good read beautifully written and easy too for a beginner like me and the last 2 chapters were brilliant but there was something weird about it. I couldn't connect to the characters or the story in anyway. Maybe it's because I don't find 'The american dream' relatable?

I'm not getting why it's a classic piece of literature and a must read for everyone. Can you help me?

P s- It was my 5th book ever since I started reading