Step 1: Add a little bit of oil to taste.
Done.
Take your crappy canned soup and toss in a bit of butter, olive oil, or regular vegetable oil. Sprinkle some sesame oil into your homemade ramen. This is basically the single most important difference between the soup which traumatized you as a child and the inexplicably edible soup you get from restaurants.
Don’t suffer through fall and winter. Soup can be a lazy convenience meal you which can taste good without a lot of effort.
As someone who makes a lot of soups, the best thing you can do to improve a soup is to make homemade stock and take your time about it.