I've had my own ecommerce craft shop, not on Etsy. If you don't have a lot of different types of items but have multiple colors and styles, have ALL of them up. A lack of a big inventory doesn't need to look like you have bare shelves.
The most obvious answer is SalesForce's app exchange. Most CRM platforms have similar marketplaces so even if you don't integrate with SalesForce those would be a great starting point. After the marketplaces I would look to partner with sales consulting firms. There are a lot of sales operati...