Yes, I can recommend a novel called " The More God I Am ". The protagonist of the story was a transmigrator. Although he was very confident in the beginning, he realized that he was as weak as a rookie when he stepped into the true path of immortality. However, after experiencing some setbacks, the protagonist gradually grew into a powerful Immortal Cultivator and finally returned to the peak. There are many topics related to increasing self-confidence in the plot of this novel. I believe that reading it will help your mentality. I hope you like my recommendation.😗