Do you have bottlenecks in your process due to product changeovers or breakdowns?
Maybe the answer is adding redundancy in the department where you are experiencing the problem. A duplicate machine setup can allow for double the capacity during high production periods. It can also eliminate the need to swap out tools or other materials due to different production runs. When breakdowns occur, equipment can be swapped out to keep production moving while repairs are being made.

Planning for this keeps production levels high.