Instill the correct concept of making friends: set an example. Take children to friends' parties appropriately. Of course, the content of friends' parties must be more suitable for your child, which will help him broaden his horizons and understand the importance and influence of friends.
Create an atmosphere of making friends: take your child to participate in some theme activities, in the process, let him know children of the same age and develop friendship on the basis of the same interests.
Communicate with him more and understand the child's psychology.
I wish happiness