Both sound excellent, but if I had to choose only one to start, I have been itching for some Jing Yuan and Zhongli for a while now. Let them have tea, play their various versions of chess, and talk about old dead friends.

If that sounds cool, we could either do Zhongli visiting Luofu or the Luofu coming to Teyvat for some reason (handwave mumblemumble handwave). Whatever you prefer! Also open to a bakerstreet meme if you see something that catches your eye (for either Jing Yuan or Neuvi).