How to make a variation code?
you can make a list of links like
const links = ["link1", "link2", ".."] then in your code, you can do
.setImage(links[Math.floor(Math.random() * links.length); ]).
At the moment, you make the setImage use the image
https://2img.net/h/25.media.tumblr.com/tumblr_m5kz58xyAo1rxsvxdo1_500.gif which means that image will be displayed every time.