For a start, to reduce the number of violent crimes, get rid of the 2nd amendment. People say that it is written in the constitution. So it can't be changed. It's an amendment. Just amend it. Get rid of all military style firearms and pistols.
In Australia, after the Port Arthur massacre, the then government did just such. We were starting to have a lot of siege type events that involved military style weapons.
Get rid of the elephant in the room.