Ok, so you have Dungeon Depths, which has lots of great underground sounds, creepy echoes, music, distant screams, walking on uneven ground, etc. Flooded Cavern would be great for a water dungeon. Using Dungeon Depths combined with Elements - Fire or Elements - Wind would be a good way to do your other themed dungeon.
For a straight cave, Sci-Fi Player’s Sub-Terra is a great one.
Towns/Villages - Magnimar is your big city set, and Brindle Town is your small town set.
Journey - There’s Wagon Journey, for general travel sounds. And Storm, with the thunder, wind, etc. for when things go from bad to worse!
If you want some variations in battle sounds, tell me what monsters you’re fighting and I can get very specific.
For some general organization, check out this thread - I’ve been making organized campaigns with all soundsets of various types, all monsters, all fights, everything for a town or a mountain or a farm, etc. Some good generic campaigns to help you get organised!
I hope this helps!