Okay so if you want that specific Howl energy you absolutely need to check out TJ Klune's stuff - The House in the Cerulean Sea especially hits that sweet spot of found family banter and magic that's just vibing in the background without being all serious and intense!
Beyond what's already mentioned, I'd also suggest looking at Swordheart by T. Kingfisher (who also writes as Katherine Addison) because the romantic dynamic and witty dialogue between the main characters has that same delightful spark, and the whole tone is just... fun, you know?
For actually finding books going forward, don't sleep on StoryGraph if you haven't used it yet - it's got better algorithms than Goodreads for matching specific vibes rather than just genre, so you can really dial in what you're craving!