Starting a minimalist lifestyle doesn't mean you have to immediately throw away everything or live a limited life. The point is to learn to distinguish between what is really needed and what is only bought because of a moment's desire. By reducing non-essential purchases, monthly expenses can be more easily controlled.
The simplest step is to check your shopping habits over the last few weeks. Try looking at expenses that are not really necessary, such as buying goods because they are on sale, ordering food too often, or subscribing to services that you rarely use. From here you can usually see several small leaks which, if collected, turn out to be quite large.
A minimalist lifestyle can also be applied to items you already own. Before buying something, ask whether the item will actually be used and whether you already have an item with the same function. The habit of postponing purchases for a few days can also help differentiate needs from impulsive desires.
Apart from reducing shopping, make use of items that are still suitable for use. Not all old items need to be replaced just because there is a newer model. By extending the useful life of an item, money that would normally be used to buy a replacement can be diverted to more important needs, such as savings or an emergency fund.
Most importantly, don't think of minimalism as a race to have as little stuff as possible. Everyone has different financial needs and conditions. The main goal is to make life more organized and spending more conscious, so that money is not spent on things that don't actually provide much benefit.