This might not sound like an immigration reform but we are having some issues and needing immigrants because we aren't having enough babies so I would likely start some influence campaigns to make it feel like everyone's patriotic duty to have 4 children by the time they are 30.
Some employers claim that Americans don't want nasty jobs like slaughtering cows and they are entirely dependent on savages from third world countries so maybe some subsidies for these industries to find ways to hire American born workers. We could also just let these industries suffer so they are forced to modernize.
Border security is important, but my main efforts to curb immigration would be to target employers of illegal aliens. The employers are getting the gestapo at their door not the immigrants themselves.