How can I find a girlfriend in my 30s?

I’m trying dating sites but not sure about the quality of girls there. Maybe Tinder? Outside of work I don’t do a lot of social activities. I’m in a new city where I don’t know too many people compared to where I grew up.
Tinder
Ask out girls at work
Ask out girls at random
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How can I find a girlfriend in my 30s?
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