The best way to convince people is probably to show them the existential threat of multiculturalism. Essentialy the same kind of things that Japanese Jared, Junglemeat John, and Señor Fred do already. The limitation of disseminating information by popular online platforms complicates things somewhat and reduces the scope of the message, though I think many people do understand innately the difference of the races. Some, like Japanese Jared, separate the high IQ races from the lowest one to reach broader audiences (Jews and east Asians), which may be effective? I don't know.