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For other people having this problem, I'll summarize some tips from in the Discord

1. It very useful to retreat from my first few dungeons, with the main objective being the completion of level goals
2. At the start, focus on leveling your team. Heals scale with HP, so having a few extra helps. Be willing to leave early to do this.
3. In terms of team composition, what works is 3 DPS, 1 healer / 1 cursed class tank, 2 DPS, 1 healer. Armor durability means you don't want long fights and healing each room means you don't need to heal to full (though you can stall when there's one enemy left to do so).