There are many speculation about bitcoin price that it will drop so hard. If we will not take the risks in buying at the low price and suddenly it become soaring high. We will feel regret again by not taking the opportunity, so I'd rather hold and wait for the price to high again.
That's better but if you have excess money then you can buy some bitcoins at current price as price is below $4000 and most of the people were waiting for this price so that they can buy at lower price and if you don't want to buy then hold your existing coins and wait for the price to go higher once again.