One such light novel is 'Sword Art Online'. The MC constantly levels up in a virtual reality world.
I'd recommend 'Overlord'. The main character grows in power and levels up as the story progresses. There are many battles and challenges that contribute to his growth.
I have two novels that I would like to recommend to you: "My Luck Value Is off the charts at the Start of the Game" and "I Can Level Up on My Own." The protagonists of both novels relied on god-level luck and the automatic upgrade system to level up. The main character of the former had awakened the SSS-rank talent, Divine Luck, while the main character of the latter had obtained an automatic upgrade system after transmigrating to another parallel time and space. I hope you like this fairy's recommendation. Muah ~😗
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.
One such light novel is 'Sword Art Online'. The MC, Kirito, undergoes significant growth and evolution throughout the story as he faces various challenges and battles.
One such light novel is 'The Dragon's Legacy'. The MC is a powerful dragon and the story follows his adventures and growth.
One such light novel is 'The Ancient Magus' Bride' where the MC is a humanoid spirit. The story is captivating and the non-human MC adds a unique twist.
You could check out 'God's Legacy'. Here, the MC is an ancient god reawakened in a modern world and faces various challenges. The story has a lot of action and mystery.
One such light novel is 'The Solitary Hero'. The MC is isolated in a mysterious world and has to face various challenges alone.
The light novel 'A Monster Who Levels Up' takes a strategic approach to character growth. It combines intense battles and personal struggles to shape the characters. This makes the growth feel organic and rewarding for the readers.
One such light novel could be 'Divine Chosen'. In this story, the MC is picked by God to fulfill a special mission and embarks on an epic adventure.
One such light novel could be 'The Shopkeeper's Journey'. In this, the MC inherits a mysterious shop and discovers its magical powers and hidden secrets.