Type, or say it in a voice note: "Dealers group ke har member ko alag se Diwali wish bhejo"
You are warned twice first. They go a minute or two apart, at most 50 new people and 100 in all a day; a daily one goes to at most 20. Members whose number WhatsApp does not show are left out.
Then you can ask
“Group ke har member ko roz subah 10 baje alag se Good Morning bhejo”