This is an accepted solution.
It's just not about impressions. Only impressions won't train pixels. There are so many other variables that has to be taken into consideration. You need following events on your store to train your pixel for sales:-
Going through Facebook guide would be very useful. They have detailed guides on most of the stuffs. There's no shortcut for sales.
The best this you can do is event-based targeting. Those events could be;
You might be thinking about how? Well, WinAds now provide you with an option of hyper event and you can target people based on the events mentioned above.
I would highly recommend you to install WinAds