>>127268478Try to find stuff at the intersection of post-rock and slowcore, where there's still some focus on complexity without building up to the same intensity as you hear in post-hardcore. This is a really good EP from earlier this year:
https://goldenstarband.bandcamp.com/album/goldenstar-ep
First and last tracks are particularly great and brooding.
A lot of slowcore is sad, but you can find more brooding or bitter stuff if you dig. Picastro's first two albums, Red Your Blues and Metal Cares, are both great for that. Some of the band Lowercase fits, particularly the Going Away Present. Something Is Like Nothing Was by Monopot is also pretty good. Grenadilla Splinters by Exhaust.
And I was about to recommend the band Deliluh's first few albums, but then I realised they're a Slint rip-off. Does Spiderland fit what you're looking for?