How can we make more money?
Well if you're trading Altcoins and other fiats o will suggest marginal trading for you but if you're in the commodities market or trading goods and services then you should stay with the most profitable sales by buying it for less and selling them at high/good prices.
If a person is knowledgeable in trading and his field of expertise is day trading, I do not thing that this person needs a good amount of capital to earn here. This person just need at least the minimum amount to trade because he can make it multiply in just a single day. Taking advantage of fluctuation and the gap between sell orders and buy orders.