There are many approach to making profits when the market is down, you can hold half of your coin and sell the other half in occasional bounce of prices during bearish market. Averaging down on prices of your coin when it fall is another approach!
Holding multiple coins will not be the solution to the problem, but knowing which coin you want to be holding, when you want to be holding and for how long you want to be holding is what is important and from what I know, you cannot do all that without learning all that is necessary to know so as to trade effectively.
The best way is just to know your bearing in the market and act according to what you know and not what you feel. Trading is not gambling and without strategy, you will be in that position.