I would like to do another outdoors tileset (with cliffs, water, a variety of trees, and maybe farm-related things) before I move on to other settings. I won't decide for sure just yet though.
As a paying customer and loving fan I would 100% vote for this. Especially if the next tileset is also compatible with this one and the dungeon tileset. There are so many artists on Itch that do a little bit of this and a little bit of that - making it very hard to make a game with say an inside AND an outside (who'd do such a thing?!?!?!).
The other thing that might be nice with these three sets is to draw more objects / enemies, girl characters...
Either way well done. You've done another spectacular job :)