Why zero sales come in

Hi everyone.

Im new at selling in amazon but i searched a lot and im sure that my product photo is perfect, my product title and bullet points is good,i got the best price in my category ,However I do not understand that why I got zero sales, its been a 1 month. I did the PPC campaign and 20.000 impression in 4 days, just 50 click and zero sale. Could you guys tell me why I got zero sales and do you have suggestions?