Answer:
Propaganda. Lots of propaganda.
Step-by-step explanation:
I would use posters to emphasize the threat that we are facing, which would increase the fear of the people and motivate them to help. I would also emphasize the importance of ordinary citizens like them so that they feel important and valued, which will also motivate them to work. I would also deliver speeches, praising the common man and rallying them all together against our shared enemy.