I’m trying to get accounts with wholesalers but I keep getting denied because they don’t allow Amazon sellers.
Look up trade shows. Search the vendors specifically distributors. A lot better than wholesale central which is polluted with sketchy wholesalers
Aside from stating that you are an Amazon seller, have you incorporated your business email/ website/ social media accounts as your supporting document?
Yes. That is becoming standard procedure for manufacturers and/or wholesale distributors.
I deal with USA manufacturers. Almost all of them have MAP agreements, which stipulate where you cannot sell their products. That includes Amazon, eBay, and social media platforms.