Restricting Non-Administrative Users from Deleting Projects

First, I apologize if this is the second time I have posted this question. I posted it a few days ago, but I cannot see it on the board, so maybe I did not actually submit it.

We would like to restrict non-administrative users from deleting projects. I tried creating a validation rule to do this, but I got stuck. Any suggestions? Or better yet, is there a setting I can toggle to restrict this?

Thanks!