No more space travelling or cosmic expansions, please.
11.0 - World Revamp (Kalimdor and Eastern Kingdoms). Perhaps a few new islands previously missing, just to add something new.
12.0 - Vanilla/MoP style expansion in that we do something completely new and explore lore we haven't seen before. I'm thinking we travel to the other side of Azeroth and discover a new continent where no one has gone before. (Except for all those missing sailors.) I know Dragonflight has a bit of this "MoP chill" going on already, but I'm sure the expansion will quickly escalate due to all the dragons and the potential that brings. For 12.0, I'm talking a brand new corner of the WoW universe (although still on Azeroth). New peoples, new kingdoms, new biomes. Like discovering America for the Europeans.
13.0 - Underground expansion, full of caves beneath Azeroth's surface. Crystals, Nerubians, machines, underground biomes, etc.
14.0 - ??? I guess at this point I could accept an expansion where we explore more lore about Elune or something, even if it takes us off-world. But I'd prefer something like a revamped Northrend or an all-new continent on Azeroth.