I know that this might not be much, but I try to just do some little things for myself. Sitting with a cup of tea and reading, having some nice chocolate or a mocha, soaking in a bath listening to music. It's just a way to remind myself that I have value and it's ok to believe so. (They also don't take much energy, when depression hits I'm usually very tired.) Maybe have a list of things that might work the same for you?