Yellow and curly chili leaves, flower pistils and fruit fall off are caused by weather changes from summer to rainy season or vice versa (soil pH drops below 6), pest attacks and disease and also nutrient deficiencies.
The solution: Sprinkle dolomite lime in all planting holes, including holes with chili stems at least 2 tablespoons or you can also mix with Cal Ha, application once every 7 days. If you don't use mulch, sprinkle dolomite lime around the stems of many kasi chilies, that's okay
From the top, spray using Meroke Provit Maxi fertilizer + Winder insect + Mankozeb fungus, measuring 2 tablespoons each/16 liter sprayer tank. Application every 4 days. Good luck.
by.@munos