I've tried the same thing, buy and sell when you get little gains and repeat it, after few months I've made profit but I had also less amount of the coin I've traded. It seems that worked as the market was rising.
Yeah that strategy will be better than you wait too long for a higher price. precisely the greed will make you lose. because of course the price will certainly change from price increase to decline. so take advantage of the opportunities that come as best as possible. don't be too greedy