Most Americans view police in schools as the #1 way to go. This after anti-gun activists lambasted the NRA for their 'tone-deaf' proposal, as if the NRA would recommend all guns be confiscated and melted down. Prescient, rather than tone deaf.
Mental health changes are also a priority for the American people. Most of the school shootings, including those at the universities, have been perpetrated by those who were mentally ill. The mother of the latest was trying to get her son institutionalized. There are parents out there who need help with their kids, and they can't get it. That needs to change.
Violence in television and video games came third, but what are the chances of anything changing there? I'm willing to bet zero. And a gun ban? With Republicans in control of the House, I don't even think it'd come to a vote, and if it did, it would be overwhelmingly defeated. Sure, something might pass the Senate (and if it did, I'd be willing to bet we'd see a few fewer Democrat Senators for the next few elections), but without the House, POTUS is stuck with Executive Orders to achieve anything in that vein.
Speaking of banning guns, it's about as popular as arming school officials. If the government of this particular democracy were as responsive as one would hope it would be, both of those would be dead in the water.