Shopify sale for rare coin

I am looking for a Shopify expert to help me sell rare coins from shopify valued between $1000 and $5000. I don't have specific marketing strategies in mind, so I need someone who can provide suggestions and help develop a plan. The main focus for promoting the sale should be on Search Engine Optimization. The ideal freelancer for this project should have experience in Shopify, marketing strategies, and SEO techniques.