Have you tried using Bollinger Band in your trading before? if not then start augmenting it into it now. Bollinger Band is plotted two standard deviations away from a simple moving average. It is base on this principle , the closer the prices move to the upper band, the more overbought the market, and the closer the prices move to the lower band, the more oversold the market. This can help you to time the buy and sell of any coin.
Yes Bollinger bands is one utility indicator for ascertaining when to take a position in the market. I usually verify their signals by also throwing in RSI or Stochastic in. Usually a good buy is whenever price approaches the lower band from below - usually after a breakout had taken place.