If you're looking for manga similar to How a Single Gold Coin Can Change an Adventurer's Life, you might like these titles.
In Orario, the only place in the world that hosts the entrance to the massive subterranean Dungeon, there's a certain tavern where the most desperate and vulnerable bring their troubles. There, the ex-adventurer Lyu Lion uses her terrifying strength to wrest what justice she can from the shadows of the Labyrinth City! But when a girl goes missing and all evidence points toward the powerful Grand Casino, she may need more than brute force to help...!
"Hello fellow citizens. I am Yoshida the half-elf, working for the post office of the Imperial City of Idazig. My job is to deliver letters and documents to wherever you need them to be, whether it be a castle in the sky or the bottom of an abyss."
At the very north of this four-cornered world lies the impregnable Dungeon of the Dead, so-called because naught but death awaits those who enter within. At least, not until that challenge is met by a certain party of adventurers, six men and women who would one day be called "Heroes"... With this volume, the ashen tale of their youth begins!
Everyone with a dead-end job sometimes wishes for something to come swallow up their workplace…and that’s exactly what happens to Mizuki Ryosuke. Monster-infested dungeons have appeared all over the world, but he’s saved from his collapsing office by a swordswoman and a pixie. Along the way, Mizuki picks up an item that allows him to pass overpowered skills to other people—and before he realizes it, Mizuki is in high demand himself!
Set 10 years prior to the original series, the story centers around Sword Maiden's party of six adventurers on their journey to the Dungeon of the Dead to kill the Demon Lord.
Eldias, an island where only one wish will come true by capturing 7 dungeons. On the island where adventurers gather and compete, there was a boy with a perennial level 1 luggage. The experience value he needs to level up is… about 100 million!? The boy is on the path to the strongest with the ultimate skill of “never die” while facing the tremendous number that everyone is merciful.
After the disappearance of his parents, Suzuki Tooru was all over the place and somehow ended up as a caretaker of a school dormitory in Tachikawa. The dorm building is all tattered. Its student boarders are all weirdos. And of course, there are rumors about ghosts haunting it too. Turns out, that dorm is connected to another world! Although Tooru doesn’t have a single friend in class, he can always just go to the dungeon to slay monsters and level-up. There, he befriended a slime, a female knight, and even a female sorcerer. Thus, he begins another day of after-school club activities in another world!