I find in the past on a losing day I will have say 10 trades and most of them are losses whereas on a winning day or night maybe 1 - 3 trades.
So the main thing to do is keep your number of trades around the same and don't move your stops hoping a trade will turn around.
Also, don't keep averaging down into a losing trade. I found I would average down 3 times say for a long and price just kept falling turning a possible small lose into a gigantic loss. The most I will average down once and not move my stop lower anymore. Stop needs to be either reasonable or where the market proves your wrong,
Yes, sometimes you will get stopped out and then market goes a little lower before reversing but you just need to let it go and trade another day or later in the night.
Finally, if you miss a trade say because you open your charts late and price has already moved, just don't trade, and try again later in the day or night or the next day. Don't chase.
Something that helped me recently is another trader mentioned that the market does not care about your 1 contract trade. Don't assume you need to kill the trade early because you worry that price will reverse while you are in a profit and go all the back down to your stop.
Have a plan for the trade including a reason you got in, is it a valid setup, is price action favorable, can you get in at a good price with a reasonable stop. This is why chasing can be bad since your stop would need to be much lower if you are chasing. Don't initiate the trade if you feel you can't take the loss for whatever reason.
Understand your win%. If you have a 70% win percent, then 7 out of 10 trades will be wins and 3 out of 10 trades will be losses.
Realize you can have a draw down, but that does not mean your system is broken, or that you need to change how you trade unless for example, your system only works in bullish markets and does not work in bear markets.