Comment to someone you haven't ever interacted with before or introduce yourself to someone you've interacted with and friend/follow them. Afterwards, leave a comment in this post with the equivalent of "I did it!"
It doesn't have to be anything complex - it can be feedback for a fanwork or discussing something you might have in common or even simply admiring their icon. The point is to reach out to someone you normally wouldn't and connect with them, even if it's only for the briefest moment.
Did something I don't usually do and read a fic. This one here, Just You and Me, about Adam/Tommy+small child revelations by ranmaru, and it was almost perfect. Content to read again and again. Left them a review, and I hope they like getting it.