Grow US School WhatsApp Communities

I have few whatsapp groups (School & college Talk). Where i will be sharing all School & College related information to the students and parents which will help students in choosing right decisions during their schooling. Information like scholarships, internships, academic competitions, college prep tools, and countless student resources designed to fuel ambition and inspire success. These groups are city/state specific in USA. Group 1. Texas School/College talk Group 2. Florida School/College talk Group 3. NewYork School/College talk Group 4. California School/College talk My requirement is to make people to join in these groups. I need some help in social media marketing and making the people to join my group. Let me know if you can help with this and the price for the same.