I am really struggling with SP workflows, but I built one that updates the Status in a library document set (project documents library, organized in separate document sets) based on the Status in a list (project description list). It does well, but I need to be modifying the document set to get this workflow going, which is not what I'm looking to do. Document set metadata does not get regularly modified. So I need a recurring workflow that would get triggered by the change of the Status in the list, every time the list gets modified.
Could someone, in screenshots, explain to me how to build a workflow that would do that.