The best day trading strategy is the opening gap strategy. As the name suggests, day trading is a strategy in which traders open and close positions on a particular trading instrument during the day, but typically do not hold any positions overnight.
What if you're at loss when you're about to close it as the rule of itself says that you don't have to hold any position overnight?
I find it hard to follow such strategy like this and that's why when I trade, I'm making sure that it's either loss @ 5% or winning more than 5%. That's easier to look at especially if you're at day trading.
You don't want to get a loss if you're closing the day with your positions and it doesn't matter whether you've gained much or just a little.