When your company sign a contract to sale over production quantity. what is the method to commit with?

First I commit with them for extra time.Tried to increased my production with different source ( Increase man power, Over time, Set machines for more production, Add new technology.)

Out source part of it, as you may out source another producer to produce the quantity that exceed your capacity.

Extra advertisement, extra power to sell. Special offers of product (special price) should be provided