Meet up groups! If you have a hobby or other interests there tend to be groups around the city that get together to participate/share in those kinds of things. I personally was into longboarding and snowboarding and was able to find groups that met up to either grab lunch/drinks or who met up and planned trips for riding in and around the city. It was a little intimidating at first but after going a few times I started to get familiar with folks and was able to branch out more.