This is what famous investors recommend doing in down markets.
Warren Buffett:"Be fearful when others are greedy and greedy when others are fearful."
Baron Rothschild:"Buy when there's blood in the streets, even if the blood is your own."
Charlie Munger:"The big money is not in the buying and selling, but in the waiting."
John Templeton:"The time of maximum pessimism is the best time to buy, and the time of maximum optimism is the best time to sell."