Here is the English translation of your latest passage, using simple vocabulary, 1.5 line spacing, and keeping the font inside square brackets unchanged. Em dashes have been minimized, and inner monologue is italicized.
"It's unusual for this place to be this quiet, with so few visitors."
Mel cleared her throat and nodded. Lately, not many adventurers had come to the 55th floor. She didn't know what was happening on the surface that caused so few adventurers to stop by the dungeon.
She and the others knew that their main income came from the adventurers, whether buying drinks and food or purchasing weapons and gear.
"I don't know. They just haven't come. I don't know what's going on out there," said Mel.
If even Mel, a citizen of Midgard, didn't know, then it made sense that Agares, an adventurer in the dungeon, had no clue what was actually happening above or below.
