Hope you are doing fine.
As per Amazon policies, we are now unable to continue with AMZ review. Amazon suggesting to not to use discount coupons to get reviews so we are going to remove this review system. Please note earlier amazon seller policy didn’t have this point but now they are clear now. Check this https://www.amazon.in/gp/community-help/customer-reviews-guidelines
The best way is to get your friends and family involved into it also you can contact buyers and ask for reviews.