Although that might be a good and profitable move in the future. What I don't totally agree on is the "sell all" move. I think that you can try to dispose off those coins that are proving to be non-profitable or at least won't be in the next few months, especially if you're only eyeing for a short term investment. Bitcoin is always the powerhouse in the cryptocurrency market and holding it for future use is never a bad idea, I think. However, there are still lots of promising altcoins in the market that could be considered for a semi or full long term investment that could yield good profit. To support this idea, I think one should get all information available to him in the internet or through news platforms and apps to give him the best possible scenario on whether to hold or sell some assets. For that, Daneel (daneel.io) could be considered because it can give you analytical market data showing the current trends and changes with altcoins and also bitcoin in the market. It also has this function of showing you market emotions which are consolidated through the feelings of people and how they judge what's happening in the cryptomarket, plus their opinions on what moves to better follow to avoid loss.