For depression (the normal non-clinical type):
-regular exercise (preferably outside in good air and sun - swimming also good even indoors)
-eat a diet containing more fish and fresh vegetables if possible
-NO ALCOHOL, NO CANNABIS, NO DEPRESSANTS OF ANY KIND (this includes over the counter anti-histamines, prescription tranquilizers, or similar)
-NO STIMULANTS stronger than coffee (because whatever goes up, MUST COME DOWN!)
turn off the TV and radios, stop reading the newspapers or reading on line news, and instead read a good book before going to bed and listen to good symphonic music during the times you used to spend on the media news or "media entertainment".
If all else fails, you might should seek medical attention, but most folks don't have to do that.
Let's face it - You show me someone who doesn't become depressed by the world today, and I'll show you someone too stupid to live.