WOW!! Though question as this can get into the existential. Live life to the fullest. Be with family and friends. Exercise and eat and sleep well. Find a hobby. Get a career that you love. Help others. Get a pet. So many parts of life to promote happiness. Now being happy and not being depressed are tow different things. So if you are depressed seek treatment with a psychiatrist or therapist or both.
It's the journey. An old saying is "happiness is in the journey". In spite of the cliche nature of that saying it has a great deal of truth in it. Happiness as a result of a goal achieved is real but fleeting. True happiness is a continuous process of doing things we choose to do and enjoy doing. One goal reached demands another goal to be set or the happiness turns into a chore or even worse, a burden. Enjoy!
You can't always be. In Happiness: Unlocking the Mysteries of Psychological Wealth, Robert Biswas-Diener stresses the importance of directing your attention to the good, checking your interpretations of events, looking back and savoring moments that made you smile, using your strengths, having a calling, balancing pleasure with meaning, focusing on relationships, and remembering it is a process, not a place. Best.