It depends on how powerful their soul is. If they didn't do much, LARPed a bunch of rubbish, yet still on a low level, nothing will really happen other than their own fate and their own mental illness, plus whatever enemy curses apply to much of humanity.
If they've gotten higher and stop doing everything, that can be highly dangerous for the reasons HPS Maxine stated before. You can't just climb down from a routine like this, it causes all sorts of imbalances in the soul to stop doing everything, which is exactly why the mythology has so many stories with instructions to NOT LOOK BACK. Also, you are basically glaring on the Astral, so all of that applies too.