Having Trouble After Uploaded Php Shell

Hey everyone.

doing some pentesting to a website, i decided to search all the websites hosted on the same server and then look for sql injection in any of the websites.

After i found the site, i managed to upload the shell successfully but the shell it only shows me the folder of the vulnerable website but not all the others web hosted.

Is there a way to see all the others websites on the shell?

And it's pretty obvious that the server has a lot of webpages because it says:

Free 91.84 GB of 979.38 GB (9.38%).

P.S: tried my best with my english here so...