I’ve only ever played 5e for my ttrpgs, but with WOTC showing its true colors, I’m trying to find a new system to adopt. I’ve been seeing people say Pathfinder 2e, and while i have a digital copy of the book I’ve been reading, i didn’t realize how large it was until i saw it in a game store; the core rulebook is almost 3 times as long as the 5e PHB!
I guess what I’m looking for is a system that isn’t as heavy as Pathfinder 2e but still has depth to it. Do you all have any suggestions?

A bit different in terms of setting, but I love Pendragon. It’s an RPG where every player character is an Arthurian Knight, but based of the literature, not historic sources. It uses a heavily modified BRP system and uses it extremely well. There is a starter set for the upcoming edition on drivethrurpg, or alternatively you could look at 5.2 and get the Great Pendragon Campaign, which lasts from the end of Arthur’s father’s reign until the end of Arthur’s.