Panfandom is hard. I belonged to a game for a great many years, but when there was a change in the mods (who was modding, I mean) things changed that made the game no longer something I cared to be a part of. A friend and I are putting together a panfandom of our own right now, hoping to open after the first of the year at some point since the holidays make it hard for us to do much as far as work on it. But we have a couple players patiently waiting for us to get it going. Even if it ends up staying small, we know we have interest.
This is a poor time of year to start games because many people are traveling and so forth. I have a game I'm trying to get set to reopen, I've got four players already, but I'd like a few more before we actually open for play.
The key to getting a game off the ground is to, in my experience, have a least a small group of friends who are willing to play there in a variety of fandoms and have the taken page updated properly. Regardless of how long a game has been around, the first place I go to even decide if I want to bother reading the nitty gritty is the current cast page. I also like to see, even just a simple name, of who is playing what character so that I can see that there's more than just one player there (and not just one player character hoarding -that's a red flag).
People say original settings grab people, but panfandoms are somewhat limiting in what can be done setting wise. Because you have to find some cause for all these fandoms to interact and that usually ends up being some god-like figure (a sentient city, a supernatural megalomaniac... etc). I never worry so much about the setting. It's either going to connect with someone or it is not going to, there's no way around it.
The best bet is to talk to people who you'd want to play with you, maybe players you were in other games with, get their opinions and go from there. It always helps to have a small circle, at least, to start with to get it off the ground.