optimize and manage amazon store USA and Japan

My brand develops and designs a series of interior decorative materials on PVC/PET, Acrylics, Aluminium. The brand receives steady traffic and sales on Amazon in categories of wall-decor, adhesive sticker, decorative tile. Looking for expansion in sales with more new products, we are looking for expertise who can:
1) Analyze and make improvements on traffic, sales conversion, and ultimate sales turnover on existing products
2) Make tactical plans includes PPC, promotion, listing improvement, keywords, customer rating
3) Demonstrate the Why as well as How to execute
4) Country of selling includes: USA, Canada, Japan

The talents with proved ability, and with proved record would be invited to partner on New Product Line.