Anyone have good advice for making friends in one’s thirties? Online or IRL?

Assuming you're cool with meeting up with strangers in person, meetup.com was a good way to find people of like minded hobbies (like board games). You'll get a wide range of folks depending on the group itself but it can be helpful if you're trying to "refill" your own social needs at least in the beginning and hopefully make some friends as a result. Helped me out of a rut when I found myself alone with no friends far from home!