In a Slump, Looking for Next Read

I’m not sure if this is the right place to post but I thought to try

I've kind of been in a slump lately and I'm in the mood for something more specific which has led me to pick up and put down a lot, I've also tried researching, but I thought it best to ask for help to get better results. This might be long, want to try and give the best idea of what l'm after, l'd appreciate your help.

Some things I'm looking for are:
-Gripping characters): I need to be able to actually care for the characters) or | find it hard to stay with it. (I'm not saying they have to be morally good by any stance.)

-Grim Dark: I think this sub genre brings a lot of reality in a way to these stories that really appreciate plus / like the violence and moral ambiguity, it's similar to horror in a way that gives an escape to another more horrible world that makes our own seem more comfortable to return to.

-Atmospheric and Adventure esc: I don't necessarily want a good portion of the story being the same place or the plot set on just one thing, want there to be adventure and variety. I'm thinking, dungeons or caves, necromancy or the undead, good action, cool atmosphere (forests, abandoned buildings/ architecture…)

I have heard a lot about the Sun Eater series by Christopher Ruocchio even though it’s supposedly sci-fi mixed with some fantasy. I don't shy away from thicker books or series, and it does have to be adult, otherwise it doesn't have to check every box but the closer the better. But my real question is does something like this exist?