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.
Why should block halving have an effect? Even if there would be an effect then it would be a speculative one. And speculators have the setting that they will await the future. So they will adapt before. And if they await a price rush then that will happen some weeks before. Might even crash at block halving when the further rise is not happening then.