1. Provide opportunities for children to interact with other children. Let children participate in kindergarten games and activities, so that they have the opportunity to communicate and play with other children.

2. Encourage children to share their toys and games. This can make children feel proud and valuable, thus increasing their contact with other children.

3. Teach children how to greet and greet others. This can help children build a good first impression, which makes it easier to make friends with other children.

4. Encourage children to participate in team activities. This can help children learn how to cooperate and collaborate with others, thus making it easier to establish contact with other children.

5. Provide support and encouragement to children. When children encounter difficulties or setbacks, give them support and encouragement and let them know that you believe they can overcome difficulties and make new friends.