How to save cost to ship from China ? Do anyone have experience to arrange shipment themselves ?

I have a very bulky item shipping from china. I ship about 10 40-ft container yearly. The shipping cost has gone down a lot recently but it is still not cost viable.

How should I save the cost ? Will it be possible to save cost by arrange the shippment myself but not through the agents. Provided that I ship only one kind of product I dont have a variety of products.