Warbling is a term used to describe singing or chirping in a melodious manner. If you are looking for synonyms for "more warbling," there are many options to choose from. Some examples include trilling, singing, chirping, caroling, twittering, warbling more, warbling louder, and serenading. These words all convey a similar idea of singing or chirping in a pleasant and sweet manner. Whether you are discussing birdsong, human vocals, or any other type of melodious sound, there are plenty of synonyms available to help you describe the beauty of warbling in all its forms.