It's simple. If you want to buy a large thing - take a picture of it and wait 30 days. If during this time the desire does not disappear - buy. This is what you need.
If you are going to buy some little thing - close your eyes and count to 10. If you don’t want to buy, buy.
Small pauses before buying - this is an opportunity to drive out emotions and turn on the brain. When the brain works, spend less money and start saving.
Try and write your opinion on the method 30/10 in the comments.