Make sure chronically working poor stop being poor. This is environment that breeds all kinds of radicals and fuels organized crime.
Make every crime prosecuted again. No unreported rapes please. No thieveries that get unaddressed. No corruption that gets reported in media but ends with a slap on the wrist. Right now it feels impossible because of sheer numbers of such crime. Very simple: those numbers just got to decrease to tenable levens.
Stop war on drugs and redirect effort towards real crime. Drugs can only be battled by going after their social base - poor, disgruntled, illega immingrants.
Demilitarize police and make them act as defenders again, not a privileged caste with self-interest.
Everybody got to spent time and effort on cooperating here, instead of looking the other way AND instead of radical "activism" that only increases rifts between people.
In many places migration also needs to be taken care of, because it's impossible to clean a house when its door just keeps swinging.