I believe that happiness and unhappiness are sides of the same coin and after all, if one doesn't exist, the other doesn't exist either.
obviously we must aim to reach the maximum level of happiness so when we are unhappy it is necessary to act and make our life better in the fields we do not like.
I personally aim for serenity, however, more than happiness, the first is something lasting and stable, the second by its nature will always alternate with moments of unhappiness.
Nice post, thanks for sharing!