What causes Bilbo's Baggins' side to reemerge?

Bilbo Baggins' Took side reemerges primarily due to his encounter with the unexpected adventure brought by Gandalf and the Dwarves. The allure of adventure and the thrill of the unknown awaken his latent curiOSity and restlessness, contrasting with his comfortable, predictable life in the Shire. This internal conflict between his Baggins and Took identities drives him to embrace the journey, ultimately transforming him into a more adventurous and courageous character.