What does f. scott fitzgerald suggest about the state of the american dream

In The Great Gatsby, Fitzgerald uses a variety of literary devices to portray the American Dream. One example is the the green light that symbolizes Gatsby’s hopes and dreams for a life with Daisy. Another symbol is the Valley of the Ashes, which represents the ugly consequences of America’s obsession with wealth. Fitzgerald uses these symbols to convey the illusory nature of the American Dream.

I've actually never heard of the guy. but, atleast he doesn’t rap/sing about drugs and girls, but he still have a very high view of himself, which could possibly cause annoyance