Maybe an online group like a Discord or irc for like minded people to hang out?
Talking with people with similar level of experience and knowledge definitely is amazing. I used to spend time with a few ex-colleagues from time to time. We had amazing discussions since we knew each others’ experience and level of intellect. I went to other meetups and it’s difficult to find people of similar background and experience.
If you're interested, another commenter here set up a Discord server.
There's the subreddit /r/ExperiencedDevs, but that's less social and more Q and A.
It might be worth checking into Discord servers to see if there are any that cater to more experienced devs. If you find one, let me know.