As boring as it sounds, concentrating on your work increases your income and also gives you less time to buy things you don't need.

Old clothes, furniture, or appliances which you no longer use, can fetch you money.

Also, when you look at the stuff you bought and you never needed, maybe you'll rethink before buying junk again.

Be mindful about how you are spending money, instead of going on a daily splurge without thinking.

When doing impulse buying, ask yourself is it worth buying, or does it matter. Be more protective of your hard-earned cash.