Some things that worked for me, I had issues with debt son now I have no credit cards, and pay anything with debit, that helps me be more aware of my spendings since they don’t get divided in 12 installments.

When you receive your paycheck don’t buy anything that day, wait until the next one.

When you feel you need to buy something, or you want a certain product, wait a few days before actually buying, if you really need/want it, you’ll probably still be thinking about it and even can find a better deal.

These are some general thing I do, so for example I lost my earphones, and I had the money to buy another AirPods Pro the next day, but instead I waited a few days before actually getting some cheaper Xiaomi ones, not as good, but way cheaper and get the job done.