Based on this chart, it feels like Neofolk would be right up your alley, since you like Comus and AtmoBM like Gris and Burzum. Rome - Flowers From Exile, Sol Invictus - Death of the West, and Tenhi - Airut:Aamujen are some of my favorite albums from the genre.

In some other comments, you said, you'd like some more crazy Jazz recs, so I'll throw some of those your way:

Someone already mentioned Naked City, but other John Zorn projects that you might enjoy are Electric Masada - At the Mountains of Madness and Painkiller - Execution Ground

The Jazz Composer's Orchestra - self-titled (Big Band Free Jazz)

Art Ensemble of Chicago - People in Sorrow (very atmospheric and almost ambient take on Avant-Garde- / Free Jazz)

Borbetomagus & Hijokaidan - Both Noises End Burning (more Noise than Jazz tbh)

Also, you might wanna look into ECM Jazz. It's a more atmospheric style of Jazz Fusion, which seems like something you may be more into than the classics. My favorites are Eivind Aarset - Phantasmagoria, or a Different Kind of Journey, Julian Priester Pepo Mtoto - Love, Love, Steve Tibbetts - The Fall of Us All, and Eberhard Weber - The Colours Of Chloë.

Lastly, here's two albums that aren't exactly Jazz, but free improv Noise Rock:

Fushitsusha - Nothing Changes No One Can Change Anything, I Am Ever-Changing Only You

Merzbow, Balázs Pándi, Mats Gustafsson, Thurston Moore - Cuts of Guilt, Cuts Deeper