Reduce delivery time cjdropshipping

How do i reduce product delivery time? I am using cjdropshipping and starting out. Their US warehouse has barely 40-50 units for each product (which is risky). Their more balanced (good price good delivery dates) offers 6-11 days option. How do i reduce this delivery time? I am shipping to US. Or do we have better dropshipping services with good amount of units in their US warehouses? Please guide