According to Osho, nature has no external aim; a flower blossoms for the bliss of blossoming. Humans need 'purpose' only as a temporary medicine because we’ve become unnatural and cling to goals. Use one purposeful thorn to pull out the thorn of purposiveness, then discard both. Ultimately, live purposelessly yet fully: act from intrinsic joy and spontaneity, not for outcomes or rewards.
Be like a flower—just be; if you need a goal, use one last goal to stop chasing goals, then drop even that.