Let him expose himself to people.
You did not mention details. But anyway
Tell him to
1- smile to everybody he meets
2- Say greetings/say salam to everybody he meets
Guarenteed tips to make friends, however to make them stay needs little more effortsAm I hip or old?
Teach him to be nice and polite, smile at people when they walk by, don't be scared to ask for help with things, and he'll find friends in unexpected places in no time.Bloated tummy