They're drooping because they receive little water when you water them. My advice is that if you have a 7-liter pot, you should be giving 250/300ml every 48/72 hours. You should really control the pH of the water with a meter when watering. It's really important that the growing area is absolutely clean; don't have bottles, leftover soil, or fallen leaves between the pots because that's a breeding ground for future pests. I hope this helps, best wishes and happy growing 💨