This method has probably been the most effective way to make consistent profits over the past year or so. Since the bubble burst in early 2018, the vast majority of coins have been trading sideways within fairly limited ranges (barring a lengthy lull at the beginning of this year). If you were able to follow a strategy of buying when you saw the currency relatively undervalued and then sold it within a period of about a month, you could make a decent regular profit over a reasonable length of time.

The key with this is not getting too greedy: you need to set yourself a target of 10-15% and then sell as soon as this level is reached. It doesn’t sound like a lot for a market that is famed for its volatility, but when you can do it safely around 4 times in just six months, you can easily manage an annual return in the order of 100%.