If the grid is down in a major way the first place your mind should visit is has ww3 started. Go look up Nuclear War Survival. You can print a million pages. The next question is limited or total war scenario.
If none of the above you need a new list. Emp, solar, cyberattack.
There’s a list somewhere here that Selco made up of the things to dissapear first in a collapse. It might be well to keep it in mind for future reference.
Just in case as they say…. cheers.