Amazon Listing Conversion Optimisation

I sell Lexie Kool Patch, a hydrocolloid acne patch with a distinctive look, size and package design, yet after almost a year the listing is stuck at roughly thirty sales a month and only fifteen reviews... (Budget: $15 - $25 USD, Jobs: Amazon, Copywriting, Google Adwords, Graphic Design, Internet Marketing, Keyword Research, Product Descriptions, SEO)