SQL doesn't display new changes from query

Question

So I have this query which is written in MySQL on Visual Studio Code text editor

 CREATE TABLE largest_number (

        n INT NOT NULL,
    );
    
    INSERT INTO largest_number(n)
    VALUES 
    (1),
    (40),
    (300),
    (600),
    (10);
    
    SELECT MAX(n) AS Largest_Number FROM largest_number;

and I decided to add a new column called 'username':

CREATE TABLE largest_number (
    n INT NOT NULL,
    username VARCHAR(25)
);

INSERT INTO largest_number(n,username)
VALUES 
(1,"Dan"),
(400,"Daniel"),
(300,"Joseph"),
(600,"Adam"),
(10,"Adamza");

SELECT MAX(n) AS Largest_Number FROM largest_number;

When I executes the code it throws:

FAIL:

  INSERT INTO largest_number(n,username) VALUES (1,"Dan"), (400,"Daniel"), (300,"Joseph"), (600,"Adam"), (10,"Adamza")

Message :

  Unknown column 'username' in 'field list'

My main is problem is when I change the

INSERT INTO largest_number(n)
    VALUES 
    (1),
    (40),
    (300),
    (600),
    (10);

to:

INSERT INTO largest_number(n)
        VALUES 
        (15),
        (140),
        (1300),
        (1600),
        (110);

The output doesn't display the new changes and displays the old values, I have been stressing over this for days why is this happening?. Googling doesn't help too.