The effort can never focus on the presence, the focus, or the attention must let go of all effort. The mind is like a bee, it kind of know where the sweetness is. If you try to take the bee to the flower, good luck. But if you leave the bee alone, the bee will end up in the right place.
We cannot "do" the letting go of anything and yet it must happend. Take the hands of the Bee and let it find its own way.