@Aecor as you're allowing un-cosy recommendations now 😉 As a linguist you may enjoy Miéville's Embassytown and Ted Chiang's Stories of Your Life and Others (includes the novella on which the film Arrival was based).
An alternative entry point to the Vorkosigan saga would be The Warrior's Apprentice followed by the short story The Mountains of Mourning, starring Cordelia's son, Miles, who is the protagonist for most of the series. Though admittedly neither they nor the early Cordelia books are particularly brilliant in themselves - much of it is reflected glow from the later entries. For me the sequence peaks with screwball comedy of manners A Civil Campaign (don't @ me, Mirror Dance / Memory / Komarr devotees), which is really only 3 books in if you read the collected editions!
@highlandcoo for more literary SFF that I didn't recommend earlier for not meeting all of @Aecor 's criteria:
Guy Gavriel Kay (except the dull Tolkeinesque Fionavar trilogy): further along the fantasy side of alternative history, far too lofty and epic for cosiness but well written and character-focused (although expect at least 2 cringey sex scenes per book). I particularly like the Sarantine Mosaic duology (Byzantium), The Lions of Al-Rassan (medieval Spain) and Under Heaven (Tang China).
Nicola Griffith, Hild: more fantastical than historical novelisation of the early life of St Hilda of Whitby, not at all feel-good but brilliant.
Susanna Clarke, Jonathan Strange and Mr Norrell and The Ladies of Grace Adieu Actually quite cosy, perhaps owing to the pitch-perfect Regency voice and faux-scholarly footnotes, though possibly too much world-building for Aecor. If you admired the style but wondered what the point of Piranesi was, these are far better.
Cat Valente, The Orphan's Tales (1001 nights with feminist twists, beautifully wrought. The stories soon start intertwining so this is a novel in the end.)
Patricia McKillip also writes beautifully in the fairy tale vein.
And Angela Carter, ofc, if she's not too mainstream literary.
Another Jo Walton: Among Others which is the perfect meta-read for literary folk who don't really get SFF but may want to.
For context, all of the above are popular/lauded in SFF circles. I will refrain from the more obscure recommendations, having probably delighted quite enough 😅