Best strategy is to have patience.You need to wait for a low price and sell after this with a high price.
We can hold the bitcoin Instead of buying the bitcoin and selling for high price...
Atleast we can hold the bitcoin until block halving.
The first time I did was analyze a bit of the market how it progressed and start trading. Before that I did my own research about the coins that I wanted to trade in the stock so as not to lose in the future
Research is really important and we have our own way of doing a research, some did it right while some did the opposite.
Whatever our approach is, what is important is we give and effort to learn and this would take us to success in the long run if we will continue.