What I usually do if prices are falling most specially if the coins are very low, I would buy more coins from a much lower price and your total amount of couns would then be divided; the result would be lesser losses. Read or research on google about books or ebooks on trading.
Indeed same as you I also did that strategies. If I have saw that coins is falling I will buy a lot of it and hold it until it pump again. Then I will sell it and wait to fall again and the cycle will be repeated. In that process you could gain a higher profit. And make sure that if you have seen that coin is falling you mustn't panic because it may lead into yout loss.