Hey Cooper so glad to see another pack from you! If you're looking for future pack ideas, I have a couple:
1) An elven kingdom area, very mystical with glowing mushrooms and stuff or you could make an "evil" kingdom area
2) An orc village / encampment area
3) A busy castle town area, or maybe a bunch of stalls for a desert bazaar
4) A fishing village (kind of like Pacifidlog town in Pokemon) or maybe an underwater city
5) An alternate/evil dimension for the final battle area