The money you spend for investment must be such money that you will not need it in the next 10 years. And you can also invest without stress. Because there are many people who start investing with a lot of money. Then they come halfway and sell their investment. For them, it is like sinking a boat in the middle of the ocean. So do not invest with such money that you have to sell your investment. And if you can keep the investment, maybe success can come.
That is where proper management of your cashflow comes in meaning that you as an investor should be able to know the total money coming in (income) vs the total money going out (expenses) and then create a plan on how to balance them........The importance of this is that it gives an investor the room to always have enough for his/her needs, while still being able to set aside some for investment.......TBH, if you invest with money meant for short-term needs, you will eventually be pressured to sell off, which may often be at the wrong time, and that is when losses can happens
Again it doesn’t really matter if you started your investment with a huge sum of money, and later sifted to a smaller amount, what matters is your level of consistency and then whether you can leave it to grow without stressing over it.