1. Wake trilogy by Lisa McMann
2. Circle Reforged trilogy by Tamora Pierce – This is really three standalones and really only needed the first book: the Will of the Empress)
3. Graceling Realm Trilogy by Kristin Cashore – I admit I need to re-read the third one again, but I was not impressed the first time I read it.
4. The Selection series by Kiera Cass – not really a trilogy but the first three books should have been massively edited into one book slightly longer book.
Alternatively, The Hunger Games by Suzanne Collins needed a third book but I didn’t like the third book in the series.