hello lemo ! hmm. I don't really have a great answer for this so instead I'm going to tell you my three favorite book series:

the wheel of time - by robert jordan. I love dense fantasy and political intrigue. I have all 15 of these books in the same printing Plus many companion books but I am Truthfully still working my way through it due to having to restart a lot over the years. I am a sucker for multi character POVs done well.

the new jedi order - by assorted authors. formative series for me. I have all 19 of these and an additional 90 others in the EU, which is the best collection of fiction to exist and I recommend it heavily. anyways, I love the politics and the sheer number of characters, plus the amount of authors working together to create something beautiful.

his dark materials - by philip pullman. I read this series when I was..14? 15? the ending of book three changed something in me. themes of loss and love and grief tied so neatly together while also being fun. I have three printings of this series and my favorite is one with "lantern slides" in between each book, where the author gives you little notes you otherwise wouldn't know