An Adventure in Another World Starting with Goblins

[Fantasy world, pseudo-DND, slow-paced adventure, Goblin] "Are you awake?" Lin Min woke up from a carriage heading to Beishan Fort. "We encountered goblin raids!" The Fat Merchant has issued a mission to you in the Adventurer's Guild to rescue his daughter Lena from the goblin lair. There is no need to recruit four or five guys by yourself. The place is already crowded with adventurers who want to earn rewards. Lin Min unlocked the upgrade system for killing goblins. Why do I want goblins? Not for your measly reward of thirty copper coins, Not to save the villagers from fire and water, Instead, a goblin gives 50 experience points! With only twenty goblins, I can level up in one day. Wouldn't it be just around the corner to get more goblins and set foot on the top of the kingdom?