I recommend the two novels,"Global Reincarnation: Infinite Evolution Starting from Octopus" and "Reborn as an Earthworm." The former tells the story of the world's people becoming creatures of another world, and Lin Xiaokong opens the path of strengthening after becoming an octopus. The latter tells the story of the protagonist becoming an earthworm. In order to survive and make up for his regrets, he began his own adventure. I hope you like my recommendation. Muah ~