Here we can see the charts of BCH/USD (up) and BTC/USD (up). Both are from Bitfinex exchange.
If you already sold Bitcoin believing that it will go down, it would be a good idea to the check Bitcoin Cash which seems moving up showing an "anti-symmetric" pattern compared to Bitcoin.
It seems that a lot of traders sold Bitcoin and then:
A) Bought US$ aiming to QUIT (for the moment) the cryptocurrency market.
B) Bought Bitcoin Cash aiming to STAY in the cryptocurrency market.
Options A and B protected investors from losing their money. With both of them, investors can later re-buy Bitcoin from a lower price, hoping that it will go up to 8.000 - 10.000 US$ (and yes, I think that bitcoin will go later very high).
IF (i repeat : IF) you believe that Bitcoin will continue to go DOWN for X time, then very probably Bitcoin Cash will go UP in the same X time as shown in the "anti-symmetric" pattern. In this case choosing option B, not only would protect your invested money, but would give you also the possibility to win more US$.
So, as I said before, it's up to you to evaluate if Bitcoin will go up or down... Then, the choice is yours.