According to Osho, to fully merge and 'drown' in the experience, stop grasping at thoughts and the surface supports of the mind. Practice bare awareness: observe thoughts pass like pedestrians without judging or following. Enter the silent gap between thoughts; there, with no footing, you naturally sink into your own being. This surrender becomes the only real support.
Watch your thoughts come and go without grabbing them, and slip into the quiet space between them, where you naturally rest in who you truly are.