When I was way younger and mildly depressed (and blessed with an incredibly stable hedonic setpoint), I used this quite a bit. First I made a 'I am not a serious person' identity (which unfortunately still bites me in the ass today) so I didn't take that sadness serious and could just dismiss it (seriously, use the right identity traits; I became way too good at dismissing sadness), and later a compartment/helper identity of 'going through this phase is normal and you'll likely grow out of it, you may not feel at all like it; probability is on your side', which helped tremendously in making me stay positive

It's incredible how far you can get just by implementing false identities and beliefs and habits and merge them into yourself. It's almost ridiculous, really