(amazon JP) Why is my product not getting sales?

I launched my product last month but I’m only getting 1-2 sales a week. It is priced cheaper than my competitors and has a coupon.

Is it because it’s made of polyurethane leather? I have to run ads using the keyword leather tissue box because there isn’t enough volume for PU leather.

Or maybe not enough colors? Should I add an image that lists the pros of PU leather? Is it because it’s an unknown brand?

poduct page