The translation of 'a monster who levels up novel' might be 'A Novel of a Monster's Progression in Levels'. It's important to note that translation can be flexible and influenced by various factors such as the genre and intended audience of the novel.
Try 'Beast's Progression'. It shares the idea of a being becoming more powerful over time, similar to the core of 'A Monster Who Levels Up'. The plot is full of exciting twists and turns that keep you hooked.
I recommend "Instant Upgrade". The protagonist of this book can level up instantly by killing enemies. One slash can level up one level, nine slashes can level up two levels, and even more than a hundred slashes can level up to level nine! Moreover, this book had various divine artifacts, cultivation techniques, and martial techniques that could be upgraded to become the most powerful existence. If you want to read a fantasy novel that upgrades quickly, this is definitely not to be missed! I hope you like this fairy's recommendation. Muah ~😗
The plot usually involves the monster's journey of growth and evolution through various challenges and battles, as it acquires new skills and powers to become stronger.