Your main business is domestic trade, and as for export, the proportion is always small. In this case, I suggest you as follows:

(1) Cooperate directly with domestic agents to collect foreign exchange. The other party's charge is also based on your business volume and the number of transactions.

(2) Find some companies registered in island areas, or Britain and other places, and only collect and pay foreign exchange in company accounts. Because the proportion is not large, you can choose some areas with simple maintenance and stable follow-up expenses.

Registering your own company can effectively protect customer information, have this control over yourself, and protect all links by yourself, which is incomparable to finding an agent.

I hope I can help you.