Just be natural and let go. At first, I chatted with some old aunts, talked about children, talked about many topics, and sent gifts. It will be fine after the first level.
Example: Hello, is this XXX (XXX's family)? My name is Xiao Deng, and I am an excellent preventive social worker in a community. I call you for two purposes. The first one is how do you feel recently? Do you have any problems or difficulties that the community needs to help you solve? The second is what activities have been held in our community recently. The theme of the activity is like this. Would you like to ask if you have time to participate in the activities?