Depression is the lack of expression; suppressed expression. (From an energetic point of view.)
The quickest and easiest way to change that energy is to start moving.
Depressed people wait to feel better or have a direction in which to move before they start moving.
It does not work that way. You have to move first.
It does not matter what you do, the important thing is t do it. Once you are moving, you'll get ideas of things to do, directions to go. Decisions you've been wanting to make will become clear.
When we start moving, the focus is off feeling miserable. That immediately opens up the energy field to receive all sorts of information that was not available because the person was strongly focused on their unhappiness.
Once you start moving, keep moving. Momentum will build. Then keep going.
If you know how energy works in the aura, it will be easier to do this. I talk about that in my book, The Workings of Energy in the Human Energy Field: A Psychic's Perspective (https://www.createspace.com/3589890)
As soon as you start closing down, move to open up the energy field.
If you're feeling lonely, many times the cause of depression, check out Meetup, http://www.meetup.com/ and join people in all kinds of events with all sorts of interests.