But if you really are curious about some hidden gems, I can't suggest enough Mary and the Witch's Flower. The vibes, the settings, the girl's feelings... That work of art literally takes you to another world, among the clouds, to the Endor College to be exact :)
For reference, my two favorite movies by Ghibli are Only Yesterday and Totoro and my top three movies from Miyazaki are Chihiro, Totoro and Nausicaa (with Mononoke coming close behind)
I kind of understand why it doesn't get as much attention as other Ghibli films (gentler pace, not Hisaishi (though still great music), mildly questionable storyline for a US audience at the time)...
But damn the dry sarcasm and subtle savagery in the English dub is delightful.
Yes, the whole "war" plot was confusing and grotesque- but that is how Sophie would experience it, right? The backstory with the witch of the waste is clearly incredibly consequential to Howl, but it's had to figure out until the end. But that's also Sophie's experience.
It's just after a character development through all the movie that you can finally see the beginning of some confidence in herself.
It reminded me of all of us with the impostor syndrome, we don't really believe in ourselves and when something good happens there must be something wrong with the world :)