Does your child (or children) have playdates over at your house? if not, do you want to encourage your child to do so and then you can invite the parent who does pickup to come in for a cup of tea?

Do you have time to volunteer at an animal shelter, library, your child's school? Easy way to meet people while doing something useful.

Otherwise other people have given you great suggestions. Sometimes I think just the desire to change is the biggest step of all.