Realizing that it's a losing streak and it will pass. Losing hurts bro, if you can take a break and go for a walk, that can help you come back to the market with fresh eyes. Also helps to prevent tilt and emotional trading will lead you to bust.
For me based on back testing. Stats will show if it is average losing streak or abnormal. If abnormal, system might be breaking down. It best to make charts to show when a drawdown is due then you can reduce size.
Only a backtest can reveal if your drawdown is within norm. I said it a million times and I will repeat it again : Always backtest your system first.