The search for our specific purpose will require obedience to His voice. Obedience is rewarded with intimacy and intimacy reveals our purpose.
He reveals our purpose only when we are so deeply invested in our relationship with Him that we will forsake all to accomplish it.
It is then that we have truly lost our life in order to save it.
He gives meat to those who fear Him; the meat is to do the will of God:
Psalm 111:5 He hath given meat unto them that fear him: he will ever be mindful of his covenant.
John 4:34 Jesus saith unto them, My meat is to do the will of him that sent me, and to finish his work.
Matthew16:25 For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.