If you try to time such market moves, you risk losing out on the best returns. If it's gone down this much already, it can't go much lower. Any stock that has declined can continue to decline. Any stock that has gained can continue to gain. Eventually, they always come back.
Many stocks never recover.
It's always darkest before the dawn. Sometimes it seems darkest just before it turns pitch black. Conservative stocks don't fluctuate much. Some of the best-known U.S. companies have failed, and their stock prices have collapsed. Look at all the money I've lost by not buying it.