For long term investment, you should buy now! Because I am sure that in a few years the price can be double or even triple, just look at the past chart of bitcoin and you will see the benefit of holding the bitcoin. And you can consider making a day trade also. Right now, it's a good season to do scalping, the pumps and dumps of bitcoin are really profitable. The market is not bullish, so every trade you are going to make is not in a high-risk position.