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The soil fertilizer is not enough, and you must use a large flower pot to raise peppers and other food on the balcony, otherwise the fertilizer will not be able to keep up.
The coriander I raise at home is raised in two pots, one big and one small, and the small one does not grow well when it sprouts.
It's too hot, you drink a few glasses of water in a row and try again, it must be better, you have to hydrate often, 80% of the human body is water, how can you do it without hydration.
If you eat too much dry, it is easy to get angry. Drink more water and you'll be fine!
It doesn't seem to be a big problem, just put it on the balcony in a bright and ventilated place, pay attention to turning the pot, top dressing phosphorus and potassium fertilizer is better, which can promote the flowering and fruiting of plants.
Maybe the window is not very well sealed, there are small cracks, you look carefully, find it to see how to deal with it!
It doesn't matter if you don't understand it, just find your renovation company or find a property to repair.