Dude, facts? The fact is that, since 2020, the US, by policy, has turned away every non-cit and non-visa holder at the border, with VERY few exceptions. The numbers of encounters have been very high, but that’s a sign of DHS doing its job.
Please cite any of those “multiple other sources” telling you that human trafficking is more profitable. I literally did this stuff for a living, as a prosecutor, for a long time. Criminal organizations are profit maximizers. Like any business, they’re going to seek highest profits possible. In Mexico, that product is the illegal drug, and there’s nothing else even close.