This is good general career advice for non-depressed people (or maybe people with minor depression), but unfortunately the severely depressed person is unlikely

This is good general career advice for non-depressed people (or maybe people with minor depression), but unfortunately the severely depressed person is unlikely to be very interested in anything (or not long enough to make a career out of it), and just doing career-oriented things like looking for jobs could be an enormous struggle. Not that it's necessarily completely hopeless, and it varies from person to person, but people tend to underestimate how difficult ordinary, "easy" things are for people who are severely depressed.