I actually found Black Friday to help me be less focused on consumerism during the rest of the year. When I want to buy something, I typically jot it down on my "thoughts for BF" list. Then, when everyone is having sales, I can dedicate time and through the yearly purchases. Also helps prevent impulse purchases as well.
A better trick is to do the same but not actually jot it down on the list. Then you’re more likely to completely do without it.
Complete abstinence has a philosophical purity but humans weren't meant to live like monks.