EB-4: special immigrants, from religious workers to abused children
The fourth preference is not one path but a set. Religious workers coming to serve a US religious organisation; Special Immigrant Juveniles, children under 21 a state court has found abused, neglected or abandoned by a parent and for whom return is not in their interest; long-serving employees of the US government abroad; Afghan and Iraqi nationals who worked for the United States; certain broadcasters, physicians and others. Each has its own form and proof, and they share one annual allocation, which has produced multi-year waits for Special Immigrant Juveniles from some countries.
Education, not legal advice.
Talk to an attorney who does EB-4 work