Once upon a time, there`s 3 manga that stoods out as related to "Goblin".

Goblin Slayer, Tenshi Slime (read more then you know why), and Re:Monsters. (The Killer, The God, and The Leader)

Re:Monsters is another isekai manga (which has been way too many), that reborn into a lowest rank. Goblin, well that sucks.
Soon after that, MC had an ability to gain skills and stats just by eating "anything". Yes "anything". But after that, they can evolved into more higher rank, just like games.

Aside of character, Rou, which is MC, is quite OP character, likeable. As well as the side character, Kichi and E. Further character would be a captured humans but since everyone said, its a typical harem bs manga, but i tend to ignore. Others were a typical cliche character.

Main majority is too many character to explain with, but of course thats normal for a whole lead of Goblin army. And also since its a Mature manga,there`s no problem with violence, gore and probably might be a lot of hentai (i mean not really visual, but there`s a LOT in just 28 chapters.)

I don`t know about "where-do-i-progress" kinda manga, but as I said, I still enjoy reading it till now (even though most of translator dropped). Recommended.