I've learned to at very least I can go outside and just be in the sunlight for a while every day. For me personally it often involves messing around in my garden for a few minutes or going for a walk. If you aren't able to do that mentally or physically then just sit outside on your porch or something and just be there observing the world. None of this stuff is a cure all but this is such a minimal thing that anyone can do and for some reason I feel a little bit better that day.