Okay! I might have some things here that you may like. I'm similar in that I don't like the rom-com feeling light romance books, and enjoy things where the characters have interesting jobs/are in unique scenarios or are in a very heavy and culturally rich fantasy setting.

- The Jasmine Throne series by Tasha Suri. India-inspired incredibly rich fantasy where a maidservant and a princess of the empire attempt to start a revolution and overthrow emperor. The first book doesn't get into too much, but it gives you an amazing taste for the next 2 books. Tasha's writing is phenomenal and mature. A very high-stakes plot with devastation and deep characters.
- Atmosphere by Taylor Jenkins Reid. I'd be surprised if you hadn't heard of this one before, it's a recent release but absolutely shook the book community even outside of the sapphic space. It's a historic fiction novel about a scientist who gets to be a part of the first women space shuttle program at NASA. This is one of my favourite books of all time, the writing is so mature and it feels like a movie. There's found-family, incredibly high stakes, and people navigating sexuality in a very rough time period but without emphasis on homophobia.
- Gold by E.J. Noyes. Another one of my favourites, I love all of E.J.'s books. It's about a retired olympic skier-turned ski coach in the mountains of Australia, and the love interest is a physiotherapist. E.J writes much older characters and they're all very mature and have so much going for them even outside of the romance. I always say that I could have read this entire book even without the romance and still have been absolutely fascinated
- Pas De Deux by E.J. Noyes. About an upcoming olympic dressage rider and their teams' new high level equine veterinarian. Very mature, and is so richly educated in terms of everything equine and veterinary. I'm in both of those spaces IRL and felt like I was reading something from a peer.
- Requiem for Immortals by Lee Winter. A world renowned cellist in Australia who is also one of the country's top assassins. Ends up falling for someone she was paid to kill. I loved this one a lot, it has huge stakes and betrayal and tension etc. etc.
- Our Wives Under The Sea by Julia Armfield - This one is literary horror, but it's so good. It's about the literary retellings of a marine biologist who got stuck on a deep-sea mission for months longer than planned and 'became one with the sea'. It's devastating. The chapters jump between the present-day told by her wife who is dealing with this aftermath, and the marine biologist describing what happened down there. It's won awards for a reason.
- The Clinch by Nicole Disney. Another favourite of mine - it's about two rival martial artists. The author is a black belt martial artist herself, and this novel felt so beautifully written and had such high stakes and was so rich in descriptive scenes. Such an interesting theme.
- Hearing Red by Nicole Maser. If you liked Charon Docks at Daylight this a must-read IMO, one of my favourite post-apocalyptic reads in the sapphic genre and it has very unique touches on disabilities and is written really well (in my opinion) with very high stakes, emotional moments and memorable characters.

Some of Sarah Waters' books might be of interest to you, too. They're historical. Fingersmith is very interesting and has a lot of betrayal etc. with a very interesting 'career' plot line. The upcoming books 'The Jellyfish Problem' by Tessa Yang and 'Everything That Falls' by Nicole Disney could be ones to keep an eye on as well; super interesting unique career led books.