The suggestions above are all very good.
I am not a club/church person, and prefer to meet people in a loose, social setting. I have always found that finding a new “hang out” works best.
Go to a local cafe at the same time every day and read a paper or work on your laptop, whatever. After a few days/weeks you start to see the same people and if you are like me, it is then a lot easier to say hello and eventually start a conversation.
Or - even if you don’t drink, find a bar and just stop by early on the way home from work and have a cola or coffee. Lots of people stop by bars on the way home from work for an hour or so before going home - and again, after a few days/weeks you start to see the same people and you become a regular and conversations begin.