If you have time, bring the family to the zoo, go to library when it has activities like story reading, go to parks which have equipment for kids to play, go to some after-school activities. If you go to church, check the church has activities for kids or not. While you are attending a group, talk to other parents and introduce your kid to other parents and other kids.
It will take a lot of time and effort, please don't give up.
华人父亲为小儿生日派对:发全班邀请只来一人