1984 is a story about ideas more than narrative. Some of these themes are explained in this video.
Orwell is today remembered as a novelist, but most of his work was articles and essays and social documentary such as ‘Down and Out in Paris and London’ and ‘Homage to Catalonia’. He was rarely happy with his fiction and other than Animal Farm (his first book to sell well) and 1984, and wanted his other novels such as ‘Keep the Aspidistra Flying’ and ‘The Clergymen’s Daughter’ to go out of print.
The ideas that found their ultimate expression in 1984 had been developed over a number of years in essays and articles and his reviews of other authors. As the nature of totalitarianism in Nazi Germany and the Stalinist USSR became better known, Orwell was better able to refine his ideas.