Be the silliness you want to see in the world. Start a pun thread or a switcharoo or all the things that used to make the old place fun. Lots of people will take that bait and run with it.
I had to go back to my feed and check but I actually get very little in the way of meme posts. That may be the way I have my feed filtered though. I would welcome quality memes, but I also may be starting to age out of what is being created at this point