It was a bubble. Every single bubble will pop eventually one way or another. With BCH it rose by 150-200% in one day, something that is definitely not going to be a sustainable level for the long term. So the dump essentially took the price down to around the starting level.

Now that it is significantly cheaper than when it was at its ATH, if you believe in BCH's future you could buy at a much better rate.

But for me, i don't believe in BCH. So it's up to you.