I am not sure how to advise you on.....How get good at faking?

When I am able I force myself to go through the motions. Just put one foot in front of the other and go with the flow. Showering and shaving makes a big difference for me. Try to participate and not withdraw. I find it very difficult and that it takes a lot of mental energy when moderately depressed. Like I said though many times it has worked to snap me out of it. My depression is very cyclical though so I am not always in one.