You can literally force yourself to be courteous, happy and enthusiastic with every person you meet. After you have forced yourself to be so for a short period of time... the habit takes over.
It makes no difference where you go, there you are. And it makes no difference what you have, there’s always more to want. Until you are happy with who you are, you will never be happy because of what you have.
If standard of living is your major objective, quality of life almost never improves, but if quality of life is your number one objective, your standard of living almost always improves.