Quite a few years ago, there was the "Seven habits of highly successful people" (or something similar) fad. The idea being if only you can copy these habits, you, too will be successful. Except it doesn't work that way. These habits are more a symptom of the sort of personality that is successful, rather than a cause of success.
My personal impression is that people have a "happiness set point" that is more or less a hardwired part of their personality. Chronically happy people will be so even if their life isn't so great, and chronically unhappy people will be so even with good success metrics. Trying to move your happiness set point by emulating habits of happy people may not work very well, no better than trying to tell a chronically depressed person "just cheer up" or a chronically overweight person "just eat less".