You can't. Pulmonary fibrosis means scar tissue has been deposited in the lungs and this cannot be removed or repaired. Currently there is no effective treatment for the most common forms of pulmonary fibrosis. Lung that is injured can sometimes repair back to normal without fibrosis and some medications are being studied that may have benefit.
It won't... Pulmonary fibrosis is something that will not go away- at our present state of medicine, there is no cure. However, it can be managed. A pulmonary medicine specialist is certainly merited in this case. With additional research, an effective therapy could be made one day.