If you want happiness, limit your choices and you will be happy with what you have.
That’s the message here and it does have scientific validity.
When people are given choices, they can vacillate between the choices and end up unhappy.
There is another way to put it, an old saying, make your mind up and don’t deviate from that decision.
You can also seem to be happy even in the worst situations as shown here. It’s an interesting video.