I'm not sure specifically as there could be many novels with such a title. It might be about a character who embarks on a journey of self - improvement or power - up all by themselves, facing various challenges alone and growing stronger in the process.
I Upgrade Alone 2's Return of the Shadow manga was a series of fantasy manga. The story was about the protagonist, Cheng Xiaoyu, who was the weakest E-class hunter. During a challenge mission, he encountered a terrifying hidden challenge. At the moment of life and death, he had obtained a mysterious leveling system. Could he use it to become the Strongest Hunter? The manga was created by the author, Dubu, and was published on the Korean manga platform, KakaoPage, in 2018. As for the specific plot development and chapter content, one needed to read the manga to understand.
๐I recommend "Online Games: Upgrade to Immortal" to you. The story tells the story of a great online game god, Ye Kai, who returned to 16 years old after retirement and started the road to becoming an immortal again. All kinds of Xianxia and Xiuzhen elements fused together to create a mythical world. I hope you like this fairy's recommendation. Muah ~๐
Some popular readlight novels could be 'The Lord of the Rings' series. It has a rich fantasy world with various characters and epic battles, which can be a great companion while you're on your own leveling - up journey. Another one could be 'Harry Potter'. The magical world of Hogwarts and Harry's adventures are very engaging.
However, if you enjoy a more in - depth exploration of the story's lore and characters through detailed descriptions, the light novel might be for you. The light novel can offer a more comprehensive view of the world and the protagonist's inner thoughts. For instance, it might explain the complex magic system in greater detail than the manga. So, neither is objectively better; it's all about what you as a reader prefer.