I don't know about LA, but I'd guess you do the same as you would anywhere. Get out. Hang out at places you enjoy. Say you enjoy the library and reading or your a writer, hang out there. More of a chance you'll meet someone you can identify with and since it'd be something you both have in common, it'd be easy to start a conversation. If you like food, there's usually little activities where you can go and try different food and things. I don't know what it's called. Sort of like when you go to a wine thing and sample different wine with other wine lovers. Check the "upcoming activities" in the paper and find something you might enjoy. Even in my tiny town there are fun things like music, food, haunted places where you can tour, etc. Going to different gatherings like that is a perfect way to meet and connect with SO many different people. Honestly, I would thik it'd be better than going to those dating groups.