RPG world all the way, this is the making of a top asset series like the handful on this site which have become successful enough to (and some have) build entire companies around the continued production of them. Especially if you make a few sets that tackle unique or original themes such as just like original interpretations of magic and mana steeped environments or like some orc or elven themed towns, encampments etc. From this and the forest pack I get the sense you have a sense for the other worldly, mystic realms, arcana infused type world building and as an enthusiast and collector myself these are fantastic pieces of work supporting that sort of theme in a market where the vast majority of the assets tackling such are let downs.
Anyways sorry for the wall of text but if you fleshed out this world and had a complete set (biomes, interior/exterior buildings, crafting stations/resources, market/merchants, dungeons and mobs to populate it - player char couldn't hurt either - it would shoot right up there with ELV, finalbossblues, seliel the shaper and the likes! I'd love to see and buy some more pieces from this series.. I don't need a 6th farm set with the same vegetables and farm tools, same couple buildings reskinned and starting to grow monotonous interactions that wont be compatible with other farm sets to expand on though.