Accelerate the process of giving the dependent residency or at least the work permit to spouses or children of permanent residents (F2A group). First of all, spouses and children could be together in the US with the permanent resident. That way, families do not have to be separated. Second, spouses and children (+18 y.o.) could contribute to increase the family income and US economy. And last but not least, spouses could look forward and maintain their careers.
Moreover, Immigration should look case by case and accelerate cases which people are following the rules and doing well.