According to Osho, real understanding dawns when worldly satisfaction exposes its emptiness: outer gains cannot birth contentment. Use that disillusionment as a doorway - stop seeking outside and turn within to the hidden inner master. By contacting your own consciousness through love, inwardness, meditation, being awakens and contentment, your natural state, arises unconditionally. Unhappiness then dissolves, not by acquiring more, but by uniting with your inner source.
If having everything still feels empty, stop looking outside and gently look inside with loving awareness, because your built-in happiness wakes up there.