If I have that kind of portfolio I will narrow it down to 2-5 atlcoins. This is to make sure that I can monitor any progress in the market. Losing 50% on one coins is very hard to recover. It will take you a lot of time to recover. That's why the second strategy you should do is set cutloss for your portfolio. Based on my experience my maximum loss tolerance is only 30% if one of my account reach 30% loss and the technical and fundamentals reflects is still downtrend I will execute my cutloss strategy.