PUBLIC EDUCATION!!
Radio announcements, social media ads, heck, even a tv commercial of anyone still watches live tv.
We need stats on what is really happening in the country in regards to crime. How many firearm offences are committed annually, what percentage of those were committed by lawful firearms owners, what percentage were committed by people not licenced to possess, what percentage of firearms used were not lawfully registered in our country, what percentage of thos who committed the offences have a history of violence. Put those numbers out there and ask the non-firearm owners where they want their tax dollars spent.