You're going to get a lot of poor investment advice here, so take it with a grain of salt. Ultimately, the choice is yours. My advice is to not watch daily fluctuations while making your decision.
Personally, I think bitcoin is a cool idea, but its "cool factor," and a lot of the price spike associated with that, is wearing off. There have been recent troubles with some of the exchanges and theft of coins, and much of the market has moved to China. Volatility,
though lower than it's been in the past, is still quite high, way higher than that of many more traditional investments. And, of course, there's always the underlying factor that bitcoin isn't really tied to anything; it has no intrinsic value, and there aren't widespread political or economic repercussions if it trades for pennies tomorrow. Are there firm reasons it could fall to being worthless? Yes, I think so. Are there firm reasons that it should be worth $500 again? I think that's harder to argue. That, at least, is like tl;dr of why I've stayed away from it; right now, in my eyes, it's a bad gamble. I would personally cut my losses and move on.