I recommend "I Can Swallow Unlimited Growth" to you. The protagonist of this novel also obtained the devouring ability after being struck by lightning. The difference is that he didn't only devour insects, but also other abilities and concepts. The story told him that he had transmigrated to a world full of fantasies and abilities, becoming an existence with unlimited growth potential, constantly devouring and growing stronger. I hope you like this fairy's recommendation. Muah ~😗