For this answer, I'll assume that the world's resources are so abundant that even the greediest human can not possibly monopolize it and deprive it from others.
According to Maslow's theory, humanity would seek lower priority needs like self realization and love, aka clout.
In other words, we turn into twitter keyboard warriors. And possibly try to kill each others for ideas and fun, rather than resources.
Before finding meaning, one has to exist, and the latter stops being a problem thanks to abundance. But if one loses hope in forging meaning, then they might end themselves.