This is an existential algorithm that everyone alive has to go through. It seems to me that you're asking about the solutions people who live in joy have found

This is an existential algorithm that everyone alive has to go through. It seems to me that you're asking about the solutions people who live in joy have found and/or made. It always involves a 'higher purpose'. Some inherited them, some build them from the bottom of a terrible hole. Nobody alive has been able to create a new one from scratch. Personally I found my purpose through lots of lectures and research into the ground truth of physical and metaphorical reality that all humans are subject to here on earth. Hint, lots of the solutions I 'discovered' and understood have been well established for millennia, a.k.a. there's no secret. Still, just as an addict has to want to change we have to find that purpose for ourselves.