Step two - After you take said walk, cook up some food - not sure about you but I find standing over a hot stove and enjoying a good meal is as calming as meditation (maybe I'm just weird)
As a non-native English speaker, "standing over a hot stove" sounded at first like a pretty hardcore way to calm down

Step three - Make some coffee/espresso (drink that strong stuff) and actively search for the shittiest, poorly written and produced music you can find... think about why you hate it. This should both help your diminishing ego, and teach you a lesson on what not to do with your music
This is the sort of "unpopular opinion" I can get behind. What makes me feel particularly warm and fuzzy inside is when I find flaws or imperfections in popular tracks.