By living our lives in the pursuit of freedom and justice without prejudice.
He gets trapped in the ocean sort of and then fights monsters and success
no, as first person is being told by one character. it can not go back and forth between time like third person, unless the narrator, who's perspective we are seeing, takes us into a flash back or has powers which allows them to see the future.
It’s the illusion of Gatsby that is great; what his life is like to a stranger looking from afar. He seems to have it all, giant house, handsome, big parties, etc. and he wants people to believe he is as great as his things. But given the end, we know he isn’t really great and he might have “it all” but without Daisy he has nothing (nothing that matters at least) and he realizes he’s isn’t great.