How do I become more approachable and less intimidating?

I'm not a type of person that gets approached by guys all the time. I've always had a reason why I'm not ready to date. But now I'm ready to date and the problem is I'm not getting approached. I was talking to a friend and he said I give the vibes of someone that doesn't want to be approached
How do I become more approachable and less intimidating?
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