A life principle to live by is to focus on what brings you joy.
This is easy to understand but hard to put into practice.
Joy is not the same as a very enjoyable activity. Joy is connected with your purpose and your vision. Joy is when you are fulfilling your purpose when you are living your vision that is aligned with your purpose.
A moment of enjoyment loses its essence as time goes by, joy does not.
Empty moments are not joy, moments that reflect you and are purpose are.