Confidence Building!

Confidence building through role-playing.
As school will some be starting, soon, it is a good time for you, the parent, to start teaching your child how to make friends at school or in social groups.
Teach your "lonely" child to look over the area and find another "lonely" child. The one sitting or standing alone, not playing with anyone, etc. They too, are bully targets.

Practice having your child approach members of the household or friends and introduce themselves, compare likes and dislikes, and build a conversation bank for your child to use at school.