Everyone may have different opinion. I personally diversify my investment. Most of my fund for cryptocurrency is in bitcoin but I also invest to other altcoin which the price has big probability to increase significantly. Usually it is new altcoin which has great people behind it, for example is TRX. Usually good new altcoin project which was dumped by bounty hunter is also good to buy, the project performance is good but the price of the coin is fall, I think such coin is undervalued, when the company did their job in their road map one by one and the infrastructure is completely established then the adoption begin then the demand increase then the price rise significantly. But the problem is the difficulty to find good project.