Sometimes panic selling can save us too. 
I am not a regular trader but I feels panic selling at the beginning of bear run can save lot of capital than waiting for too long for doing trades.
My addition is don't regret about panic selling if the prices didn't fall after you sold your crypto just move on and reinvest on the right coin.
panic is usually because traders are not ready to lose, this can be dangerous if they don't take the right action quickly so we can lose our money. then careful preparation before entering into trade is needed. do anticipation if things have become worse.I am not a regular trader but I feels panic selling at the beginning of bear run can save lot of capital than waiting for too long for doing trades.
My addition is don't regret about panic selling if the prices didn't fall after you sold your crypto just move on and reinvest on the right coin.