I don't fully understand what you mean by "cash it back"? You mean to say you don't know how to sell your Bitcoin into fiat money? We already have so many exchanges both known and not-so-known and most of them can deal with your Bitcoin, as long as you have access to the wallet where the Bitcoin is. In many cases, the seller of Bitcoin can also be a buyer but at the price the seller is dictating...and at the ongoing dip it would be wiser to wait for some weeks or even months to realize some possible profits.