What does Fitzgerald suggest about the American Dream through his depiction of Jay Gatsby and Nick Caraway?

Fitzgerald portrays the vain pursuit of the American Dream by depicting the corruption of Gatsby's soul and Nick Carraway's jaded perception of the upper class. Jay Gatsby compromises his morals, fails to develop meaningful relationships with others, alters his identity, and is blinded by Daisy's beauty in his pursuit of the American Dream. Gatsby becomes corrupted by wealth after deciding to enter the bootlegging business. After achieving financial success, Gatsby's pursuit of happiness is not over, and he attempts to recreate his past with Daisy. Gatsby believes that he can purchase happiness and eventually dies a lonely, unhappy man. He fails to develop relationships with genuine people and is attracted to Daisy's toxic personality and lifestyle. Aside from his father and Nick Carraway, none of his associates or apparent friends attend his funeral.
Nick Carraway decides to move back home after witnessing the true nature of the superficial elite. Nick is disgusted by the lying, cheating, immoral nature of East and West Egg citizens. He witnesses their chaotic, superficial lives firsthand and chronicles the demise of Jay Gatsby. Nick Carraway gives up on his dream of attaining wealth in the bond industry and chooses to live a comfortable lifestyle in the Midwest.