What experiences in the forest caused Bilbo to have a improved self-concept?

Bilbo's experiences in the forest, such as outsmarting the Spiders, rescuing the dwarves from the wood-elves, and finding his courage in the face of danger, all contributed to enhancing his self-confidence and sense of self-worth. These challenges allowed Bilbo to discover hidden strengths and qualities he never knew he possessed, ultimately leading to a more positive self-concept.