Book excerpt: New developments in positive psychology have evolved into the 2nd and 3rd waves, going beyond the individual and positive focus towards complex systems, multi-cultures, and the existential positive psychology of transcending suffering. The present project aims at developing a general theory of well-being that integrates all the above changes as the new frontier of positive psychology. At a time when humanity is threatened by all kinds of existential crises, from climate change to nuclear war, from ideological polarization to a widening income gap, we need to develop a big-picture theoretical framework showing that happiness is not just for those living in peace and prosperity, but also for those struggling in dire poverty and war-ravaged countries like Ukraine, not just for the self, but also for others, not just for the present, but also for future generations. This broader approach towards wellbeing opens up new vistas for research and interventions.