Learning how to be more social.
It may sound simple, but I constantly avoided social situations because I was worried about being judged and people disliking me. I realized by not even trying I already made people's judgements for them about me.
People are actually pretty friendly when you take a genuine interest in them. This in turn helped me to go on more dates and meet a nice woman whom I've been seeing for a couple months.
Someone told me that everyone wants to be loved, everyone wants to be liked and everyone wants to feel appreciated. I really took this to heart when interacting with strangers.