Your forced vital capacity (FVC) and your forced expiratory volume in 1 second (FEV1) suggest that you have obstructive lung disease. This is most commonly due to chronic obstructive pulmonary disease (COPD), asthma or a combination of both. Your values suggest moderately severe disease. Further testing would be helpful to know how much of this is COPD/emphysema. The testing could include more complete pulmonary function tests (PFTs) and/or CT scanning of the lungs.
The response of your lungs to the medicines is most encouraging. Given more time, your lung function may continue to improve. For guidance with ongoing treatment and for an estimate of your prognosis, you should talk with a pulmonologist about the available test results and your response to the medicines.