You may continue trading with your small capital and accumulate the profits if your not open to borrow from someone. That's what I would do if I were on your shoe.
That will be the best option, borrowing money for what is risky like trading is not a good idea in my opinion. Trading can be full of emotions which the person may not have when he was trading with small amount of money, but when trading with big amount of money, the trader ways of trading may become different and also another pressure can be from thinking that he borrows money and make mistake while trading. It is good for a trader ti be satisfywith the small amount of money he is using to trade, rather than borrowing. This even is against one of the rules of trading that traders should not trade with the amount of money the can not afford to lose.