What, no.
It won't matter how much water you pour out of it. It's still 4ml/l.
Pour 2/3s of it out and then add extra water to bring the solution down to around 1-2ml /L. Pouring water out of the premade mix won't change its potency. Its still to high the ppm will be the same.
Add water and bring EC for grow nutrient you have to 2-400ppm .4-.8EC
GOOD LUCK PAL.