There are many trading strategies which people have used overtime to make good profit out of the crypto-currency market, but one thing with the market is that it is ever dynamic. And once it is changing a particular working strategy might stop being effective over time. This is why it is important to have more than one working strategy and such strategy should be tested and retested in order to be reliable.

So when this strategy fail  a new one should be developed. And it's just text little or no difference between an existing strategy and a new one that will be developed.