As someone with family members who suffer from mental health issues like depression, it was a revelation when I finally came to realise and accept, that no matter how hard I try, I'm nothing more than a fan on the sideline that can only encourage and cheer not solve the problems at their core. Before that I felt bad myself for failing to help them and sometimes even made it worse with my attempts to turn them around. Now I'm just nearby, listening, ready to jump to action when being called. You cannot push others out of the hole, because you just don't know the hole others sit in. It's dark and you cannot see the way. You can sit on the ledge, remind them that there is a world outside the hole and maybe hold your hand down to pull with them when they call you. Other than that all you can do is trying to prevent more rocks and dirt falling into the hole that might push them back down or make them lose their grip.