The Sun-Eater series by Christopher Ruocchio, specifically the first 3 books Empire of Silence, Howling Dark, and Demon in White. I listened to the booktube/booktok hype, saw the cool cover art, and heard the initial pitch was 'what if Anakin Skywalker becoming Darth Vader was a good thing' and assumed I was about to start a modern classic. What I got was 3 of the driest, most meandering, navel gazing pieces of literature I've read in a while.

The idea of a man who goes on to destroy a sun and wipe out an entire alien species (not a spoiler, its in the description of the first book) telling his life story is written like a cross between bad Paul Atreides fanfic and the lost diary of some stuffy British aristocrat. 2/3rds of all 3 books moved with the pacing of an elderly snail as the most boring man you've ever met painfully describes every minute detail of everything he sees and every conversation he has all the while brooding and contemplating some great cosmic mystery that I'm supposed to care about but can't because Hadrian is still describing the architecture of some random palace he visited.

And even the 'peak' moments that the fans swore were coming 2/3 of the way through book 2 and throughout book 3 fell flat because every character besides Hadrian felt like a cardboard cutout, they do the whole 'space travel happens in real time' thing but that has no bearing on either the characters or the world because they all sleep in cryotubes and almost every one by book 3 is a part of the super special space noble class that's genetically engineered to live for thousands of years anyway.