Start some new ones, once a plant is stunted it will always be stunted. You will never see the growth out of it you want. I know it sucks to start over, but look at it as a learning experience. One thing to remember is to not overwater. Water when the pot feels like it is about 90 percent dry or so. The best method is to pick t up and use weight to judge. I water plants that are under a week old with a shot glass. Letting the soil dry out most of the way b4 watering again will promote root growth.
Remember Lots of light.