If you want to find material that you can practice listening to keigo with, any story that takes place in a service industry location is a good bet. For example stories that take place in shops, restaurants, basically anywhere with customer interaction, is a good opportunity to hear keigo in action. What I’ve watched recently that fits this description is the anime Isekai Shokudou.
Another thing, and this is mostly anime/manga-specific, is watch out for ojou-sama type characters, as this trope usually involves a young lady of noble origins who usually speaks keigo. It might not be your cup of tea, but the anime Shomin Sample had an entire cast of such characters, all speaking in the most polite keigo I’ve ever heard. Other examples include Marika from Nisekoi, multiple characters from stuff like Kaguya-sama wa Kokurasetai, Toaru Kagaku no Railgun, The Rising of the Shield Hero, Re: Zero. Anime with a fantasy setting usually involve a lot of keigo-speaking characters.
Another place in Japanese culture that heavily involves keigo is the workplace. So any drama/anime/movie that involves characters interacting in an office environment will contain some level of keigo. Unfortunately nothing particular springs to mind at the moment, but someone else might have a suggestion on this front.