I think of depression as spots. When you have spots, the first thing is to figure out what they are.
Maybe you have an allergy to a new washing powder. Maybe you are allergic to something you ate the night before.
Maybe you have dengue or chickenpox or shingles. It could be acne. Maybe it's boils.
Or a mosquito bit you. Or perhaps a cobra fanged you. It may be a perfectly simple heat rash.
Figuring out what's causing it will lead you to the appropriate action. There's no point in changing your washing powder if you are allergic to eggs or have chickenpox.
Depression is the same. There are lots of different causes and that's why there are various approaches for managing it. There's not one-size-fits-all.
So if you have spots, or rather depression, and you can't immediately tell why and what to do about it, either talk to a psychiatrist, a medical doctor who specializes in mental health, or talk to a therapist like me. We'll have a chat, and figure it out together.