Who said these were "easy" fixes, though? I am emphatically not claiming that "just doing something" will work. Though, fair that what I put there can seem that way.
I am more trying to claim that "just doing something" has an annoying track record of looking like "it" is what worked. I would fully believe that, in reality, the thing that worked was already at play before the success started happening. That is, fully depressed people don't succeed at any of these things.