Hello again, sorry I gave you wrong information earlier - the Marvel TV shows (Wandavision, Falcon and Winter Soldier, Agents of Shield etc.) are their own fandoms in the tagset, so Moon Knight is a distinct fandom while Iron Man and Captain America both fall under MCU. (Totally my fault, I thought Moon Knight was an MCU movie for some reason, but I was mistaken and the tagset is correct.)

Hopefully this gives you enough fandoms to sign up, but even if not, thanks for your interest!