jpeg – I want to change the size of a photo in jpg in smaller form

* Hi, I wonder how much is needed for the width and height for a smaller size and also a very good pixel quality. *

Here is the photo that I am referring to and the application is written in the screenshot I made.

JB of the GOT7 group of kpop of South Korea

Let me know how I can have it totally in the width and height that you see in the picture that you put in my
Publish because it is the maximum amount I can have to draw in the application.