Can I take over askhistorians?

Oh please make it happen. That crew is too good to be stuck in Reddit.

I'm hesitant to take a community from an existing moderator and hand it to a new user who has only been on Lemmy for a few days. I suggest you start by interacting for a while - make posts, try to drive discussions, get a feel for this place and how it works - before jumping into moderating multiple communities.