CUT ALL NON-ESSENTIAL SPENDING.
Over the course of the next 21 days, we encourage you to cut out all non-essential spending. Essential spending would include rent, bills, food, and all basic needs. But that latte, the new shirt you saw, going to the movies... all of these are examples of non-essential needs.
One idea is to write down the price of every non-essential item you'd like to buy and after the 21 days, add up the total amount you would have spent had you followed through on those purchases. Perhaps it will reveal a pattern of excess spending that can be minimized.
This won't be easy but it will likely bring to the surface some attitudes towards stuff that may need to be evaluated in order to find freedom from the tyranny of "more."