If you have lost a lot of money recently then this is not the time to buy more coins, this is the time to reevaluate your strategy to see what's wrong and why you have not earned any money, if the strategy that you created is profitable then it is possible that you just entered the market at the wrong time but if you keep going and you keep investing you could make profits, but it is also possible that you made a mistake and if you did then it is time to correct it.