If you mean the forest dungeon. I would suggest, making sure to reset all your sensitivities ect at the church then honestly its pretty easy using potions and herbs to cleanse sleep / charm and as long as you avoid resting so it doesn't go until dusk it shouldn't be too hard even on the hard difficulty.
Normally I can get it done in 3-4 runs without leveling anywhere else with 3 sensitivities. Just bring like 3 of the 200 arousal potions a handful of the 100 ones and like 5 of the anti sleep herbs a few ugli herbs and if you want it to be a little easier you could also bring some energy potions. I would suggest using potions at camps instead of resting to avoid progressing the day faster. If you still can't get past then as you said grinding for a bit would probably be recommended but it should be very easy by around lvl 15-20 even without using many.
Also I got no clue if easy or hard are reversed, never tried easy but I'm assuming you haven't reset your sensitivities at the church. Its a very common problem with newer players assuming you are a newer player thats probably the issue.