Hi, I have been a user of this forum for a long time and have helped folks on and off. I came across this service, so I thought I would share it with you.
It's difficult to send manual emails to your customers asking to review your product purchase, so you can use https://collectreviews.co/ to set automated reviews to be sent to your customers after x number of purchase dates (you would need to integrate a small code at the thank you page).
500 invitations are free every month, which means 500 emails to your customers asking to review your product. For small website owners, this will always be free.