Investing in bitcoin is a risk, as the value can crash tomorrow.
I'm holding too so far, I believe in what bitcoin represents, so I'm taking the risk. Don't invest more than what you can afford to lose however, but if you can, you should buy more.
Also have a look in other cryptocurrencies.
Well, investing is always with a risk. Holdin bitcoin at this moment of time is of course a risk also. But I think that holding bitcoin this time is a wise decision. Bitcoin is in its downtrend. But surely, in a while it will go up again. As the market fluctuates, so as with bitcoin price.