help finding more areas

I've been stuck in bone bottom, mosshome, the marrow, and deep docks for an hour, everything is locked, I guess hunters march isn't required so I stopped trying, but I don't really know where to go. I've gotten to hunters march both ways, but died too many times doing the boss fight. I have dash, but it feels like everything I need requires some sort of wall climb or extra jump or a key, which I don't have enough for considering all my attempts with the ants. any help would be much appreciated