A suggestion that you can do is to have a budget plan, either weekly or monthly. Once you plotted the budget plan, it needs to be followed and not to keep on altering it. If you are going to alter it, make sure that it is within the budget. This is an effective way not to overspend.
Budgeting helps us to carefully plan on how to spend our finances without careless spending. The simplest way is to write a shopping list and go with it to buy the items you need and stick to it strictly to avoid impulse buying.
To budget in a minimalistic way, start by tracking income and expenses, identifying necessary expenses, prioritizing spending, and setting goals. Avoid unnecessary purchases, automate savings, and use cash or a debit card to limit overspending.