Focus now on your sense of 'I exist' or 'I am'. Become familiar with your sense of I am-ness.
This is an imperative task I ask of every spiritual aspirant for this is the door. Your very I am-ness is the door through which the mind realizes its true Self as Spirit.
Hold fast to this sense of I am while staying mindfully in the moment and you will within your own season be liberated from the mind as you embrace your true beingness as Spirit aka Present Moment Awareness.