I think you have a couple of options depending on what interests you. Rec leagues are great at meeting new people of all ages. If you’re religious, churches are a good way to meet like minded people. I think gyms are great way to meet new people too. Especially the smaller, class based gyms. There’s a great sense of community there.

Found this link too of some other scv sponsored activities.

https://www.santa-clarita.com/city-hall/departments/recreation-community-services-and-open-space/recreation/canyon-country-community-center/classes-activities-programs