On other sites, especially those I haven't visited in a while (weeks to months), I'll get a screen-wide drop-down that says something along the lines of, "you haven't upvoted any questions in a while, remember OPs need love too!"
I've not seen that here, but maybe I'm active enough that I never see it. I was prompted to ask this question by a comment left by @willk, encouraging upvotes to the question. Which I thought was a good idea.
I'd create a community promotion ad, but those require too much effort to get the necessary traction.
Do we have an automated "hey! Upvote a question why doncha!" as I've seen on other sites?