Knowing that not all of my alters are depressed, how do I stop being depressed?

So I know every alter experiences a mental illness if the body has it (or so I’ve been told)

I feel like I’ve been depressed and demotivated for years. Like the fact I’ve had enough energy to get out of my house at all is crazy to me— and I have a job? I can hardly do the laundry, but obviously, not all of us are depressed, because the laundry is done, the house is clean, we have a life. I feel like I need to be medicated for how depressed I feel but I’m kind of sitting with the awareness if I felt this depressed constantly I’d probably be in long term care— and I’m not, so obviously someone else isn’t.

And in fact I know for a fact we aren’t all this depressed because I’ve been better at journaling of us together and a part specifically noted how they feel like they’re ‘not depressed anymore,’ ‘they don’t feel like they’re meet the criteria for depression’, and went as far as to tell our friends.

I guess my question is if I physiologically have the capacity to not be this depressed (because more than 1 part isn’t, meaning my brain has the capacity for it) how do I stop experiencing the symptoms of depression the way I do?

(full disclosure i’m not diagnosed but i got told i was allowed to post here and also this doesn’t exactly fall into CPTSD territory i don’t think so? maybe it’s okay)