Remove the capacity to acquire new guns, provide a place to turn them in, mandatory gun safety courses. Also teach gun safety measures in schools, not just lockdown drills. Define what's in use and teach kids to handle themselves. Better yet, a building effort across the country to upgrade school security structurally speaking would go along way in saving lives and creating jobs. "But what if we need to defend ourselves?" pass the tests or use an alternative weapon, flamethrowers are in some states classified as fireworks, swords are still a thing, and it doesn't take a genius to figure out a crossbow if you really need something.
Republicans realistically will give thoughts and prayers for all the good that does defending America's youth. Not only was that a poor time for that NRA commercial to come out but this response is going to affect voters. Inaction is cancer.