Here are some other debuts that are masterpieces, in no particular order:
Murasaki Shikibu - The Tale of Genji
Souseki Natsume - I Am a Cat
Yoshimoto Banana - Kitchen
Viet Thanh Nguyen - The Sympathizer
Harper Lee - To Kill a Mockingbird
Toni Morrison - The Bluest Eye
Jane Austen - Sense and Sensibility
Emily Brontë - Wuthering Heights
Anne Brontë - Agnes Grey
JD Salinger - Catcher in the Rye
Leo Tolstoy - War and Peace
Stephen King - Carrie
Norman Mailer - The Naked and the Dead
James Jones - From Here to Eternity
Lucy Montgomery - Anne of Green Gables
James Cain - The Postman Always Rings Twice
Dorothy Sayers - Whose Body?
Dodie Smith - I Capture the Castle
Agatha Christie - The Mysterious Affair at Styles
Raymond Chandler - The Big Sleep
Ernest Hemingway - The Sun Also Rises
James Joyce - A Portrait of the Artist as a Young Man
Douglas Adams - Hitchhiker's Guide to the Galaxy
Bret Easton Ellis - Less Than Zero
Mary Shelley - Frankenstein
JK Rowling - Harry Potter & the Sorcerer's Stone
Ken Kesey - One Flew over the Cuckoo's Nest
Sylvia Plath - The Bell Jar
F Scott Fitzgerald - This Side of Paradise
Umberto Eco - The Name of the Rose
Patrick Rothfuss - The Name of the Wind
Thomas Pynchon - V
William Gibson - Neuromancer
Patricia Highsmith - Strangers on a Train
Robert Louis Stevenson - Treasure Island
Lewis Carroll - Alice in Wonderland
Arthur Conan Doyle - A Study in Scarlet
Charles Dickens - The Pickwick Papers
Margaret Mitchell - Gone with the Wind
Frank Herbert - Dune
JRR Tolkien - The Hobbit
Khaled Hosseini - The Kite Runner
Eileen Chang - Half a Lifelong Romance
Qiu Xiaolong - Death of a Red Heroine
Henry Miller - Tropic of Cancer
Madeleine L'Engle - A Wrinkle in Time
James Baldwin - Go Tell It on the Mountain
Marcel Proust - Swann's Way