Gratitude via negative thinking
The mental subtraction method is an alternate way to elicit the feeling of gratitude.
As an alternative to looking at the bright side or paying attention to all that you have for which you feel grateful, try visualizing the absence of the people, things, and moments in your life that make it most meaningful.
Force yourself to consider the impact on your life without the the people, places, things, and experiences that are so valuable. Returning to the present moment after a short time contemplating these negative thoughts offers an unconventional but useful way to spark gratitude.