If you are plant is outside, you need not worry about pollination. Wind or bee will take care of the pollination. However you can gently shake or vibrate the brach, Preferably morning.
Even difficiency of potassium can be the reason. You can try NPK which is high in potassium like 5:15:30 or 6:12:36 2/3 gm per liter once in a week.
All the best.
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