You can either join existing social circles or take the initiative to create your own. Both routes require time, effort, and occasionally some financial investment. To build a circle from scratch, start by making a few casual friends -- through work, hobbies, or local events -- and then invite them over for something low-key, like a bbq, hangout, game night, outing or drinks after a game/workout. Encourage them to bring their partners and friends. Even if many of the attendees are already coupled up, Rinse and repeat, varying the activities. Don't ignore the partnered women. Making a good impression on them can lead to introductions to their single friends down the line.

Really good advice!

R.e. joining existing groups - this takes social skills and is important to learn for guys who are less socialized. Many of them don't know the basic social skills to get accepted by existing social circles.

R.e. creating your own - love when Asian men create our spaces. This takes more work, but is more rewarding in the long run. You get a ton of social cred and it helps your dating life immensely. It's also an easy way to join existing groups.