Cradle by Will Wight because the characters are endearing and believable and tangibly grow as people while they grow in the magic system which while we're at it is very satisfying variation on Chinese martial arts "magic" systems, the power scaling is nuts.

The world is deep and interesting and you get a lot of insight into it from other characters perspectives

It's 12 books and everything builds from everything you've read naturally. The themes speak to me, etc.