Based on the stock to flow ratio and bitcoin scarcity factor, I believe that in the future the value of bitcoin will be even higher than the increase in value in 2017.

The bitcoin stock to flow ratio is high because the addition of supply is relatively low compared to the amount circulating on the market. A higher ratio shows that the commodity is increasingly scarce and therefore more valuable as a store of value. After halving and decreasing the subsidy, bitcoin will be used as a store of value. When the amount of bitcoin reaches its maximum supply (21 million), the supply becomes limited even though market demand will not shrink, causing scarcity and the price will be even higher.

With the assumption above I will hold bitcoin as a long-term asset. But it is possible that I will use a small part for trading with short-term margin goals.