At the moment everything is going down. What was your reaction? Fear? Did you quickly sell? Or do you see this as an opportunity to buy cheap?
The worst thing you could do is buy high and sell low. So get yourself together and think of your end goal. Only invest if you feel good about it and know that there will be ups and downs. Maybe buy a little bit more when everything is down. Make a strategy and hold on to it. Don't act out of fear!