How would you go about establishing us income for an E1 visa? Background is I showed the consulate all my sales reports. I'm in a niche where almost all worldw

How would you go about establishing us income for an E1 visa? Background is I showed the consulate all my sales reports. I'm in a niche where almost all worldwide sales are in the us. So about 85% of my sales are from there. They're not considering the documents. They want a report from an accountant or an auditor. I'm producing that, but given their extreme skepticism so far, I'm wondering if there's something else I should be doing.