Get the Fans Involved
It’s not exactly a stretch to say that Overwatch wouldn’t be what it is without its very devoted fans. Whether they’re fanfic writers, passionate artists, or anything in between, the fanbase has helped the game stay popular and relevant, even when there’s not much going on. They love the game so much that even something as small as a character tease has become a straight up investigation for any Easter egg that’ll link to the eventual announcement of the ever elusive Sombra. (We’re still waiting!)
The thing most developers do to interact with fans for a game after release is a sweepstakes or blog posts. Blizzard goes above and beyond, not only putting out webcomics and a graphic novel due out next year, but also still doing online shorts focused on the characters. The wait between the shorts isn’t too terribly long, but in the meantime, fans have made sure that Overwatch is never low on content thanks to the aforementioned fanfic and art, plus awesome videos.