How to find and get in touch with the E-commerce sellers out of China

We are a professional purchasing agent helping users purchasing products from China, especially from [login to view URL] and Taobao. Mostly are from [login to view URL] because it's the largest wholesale websites in China and the price is even much more cheaper than that on Taobao, let along Aliexpress or Ebay/Amazon. Actually, many of our customers are sellers from Ebay and Amazon. Now, we want to find the following sellers and promote our services to them, but they need to meet the following conditions: 1. They are selling small gadgets instead of big items, for example, USB-Type C converter. 2. The sellers must be in other countries instead of in China, selling to their local users. 3. Can be sellers of Ebay, Shopify, WooCommerce or any E-Commerce platform, but they should already have stable business instead of a newbie. 4. Amazon sellers are not required for now due to the complexity. I need your information and suggestion. For example, if you know some seller forums, please list the forum addresses instead of just telling me forums. If you know some groups, please tell me the group name or address or can help grab me in. The reward is open, please bid with your info and prices. Thank you.