1. Decrease demand for it by eliminating gender selection before birth. China and India have massive human trafficking due to the hundred million girls aborted before birth or allowed to die afterward (China due to one child policy and preference for sons, India for preference for sons and literal cost of a girl's dowry). Their demand for brides and prostitutes is the major driver of human trafficking in that regard.
2. Crack down on international adoption because of the human trafficking it is causing. China periodically finds people smuggling unwanted baby girls for foreign adoption, and Haiti and Africa have had children with living parents offered for adoption. Salvador (either San or El) shut down international adoption when they found parents didn't know the child was going to be sent abroad, instead of leaving it in an institution until they had the money to feed it.
3. Close the West's open door immigration policy, leading to many migrants trying to come. An estimated one in three Hispanic women are raped by their smugglers on the trip to the United States. There are women traded sexually to human traffickers to get to Europe, as one Muslim man let the smuggler rape his wife when he didn't have money. Close the door, tell the world you can't take them in, and they'll stop coming - and the trafficking and related abuses will stop.