In order to open your mind, you need to switch-off, unplug and just stop.
Just sit, stand or lie down without stimulation of any sort.
Listen to your mind, to your thoughts and emotions.
Feel the anxiety and the agitated thoughts.

Do not act, judge what is happening or have any thoughts of control.
Simply become aware of what is occurring.

If you are stimulated by sugar and caffeine, you will find this extremely difficult.
It may take many occasions of practice before you experience any expansion of awareness.