Actually putting in effort to connect with people.

I used to be extremely shy, and this manifested in me not contributing much to conversations and sometimes looking a little bit standoffish in my body language.

I still am very shy, but I've since learned to work past the initial discomfort of shyness and be active in conversations, or at least make an effort to show other people that I am interested in what they want to say.

I've made a lot of friends I wouldn't have had I not worked on this part of myself. I only regret not trying earlier.

I'm not sure if this answer is in the spirit of the question, but that's the first thing that came to mind.