I would invest if I were you. This truly is a blessing in disguise. But don't panic if the price goes even more down in the weeks to come before it starts to rise again. I wouldn't even focus only on BTC, if this is what you are thinking about. If you are serious about the investment and looking for a long-term investment and steady profit, I would search for a promising unknown altcoin to invest in. But only if you read carefully the signs and the situation and if you know what are you looking for. Take in consideration the project, the team working on it, white paper, and transparency of the guys behind the project, the effort of the developers etc. I am currently investing small portions into the project called BTCN. It has everything that I have mentioned above plus a steady progress and the spread of its community. It already reached CMC and it is present to couple of exchanges. And my personal favourite of course is ETH, I have strong feelings about the future of this one. Check them out!