I think the point of life, in general, is simply to follow our nature. As we do this it inevitably leads us onwards. It is when we deny our nature that we feel life is 'pointless', for truly it is.
Experiencing unhappiness and happiness are just part of that path of following our nature. A seedling seeks the air and then the sun. If it is unable to find what it seeks, it is not only 'unhappy', it will die. Truly we are 'happiest' when we are Being and fulfilling who and what we really are.
Our spirit, likewise, must find what it seeks, must follow it's nature, or it too will never grow.