Local meetups and hobbyist clubs of various sorts are full of interesting people who are already interested in some of the same things that you are. This brings

Local meetups and hobbyist clubs of various sorts are full of interesting people who are already interested in some of the same things that you are. This brings down a huge barrier of getting to know someone: you've broken the ice merely by having an interest in a certain subject. This is why people advocate to have hobbies (i.e., not-monetized ways to spend your time) outside of work, or at the very least a "third place" where you can meet new people in low-friction ways.