I also met most of my friends in my late 20s and early 30s, after moving across the country multiple times when I was younger, severing friendships in the process.

What really helped me was getting into a bunch of hobbies and putting myself out there, starting kickboxing and crossfit, volunteering at a local historic motor race, going to concerts and festivals, music quizzes. Just a bunch of stuff that interestes me, and presumably interest people with a similar mindset as mine.