I'll list my bolds so far - I'm still hopeful of another couple of bolds before the year is over, and will do a top-up post if that happens.
I read a lot of books I enjoyed at the time, including plenty genre fiction - a shout out to the Maeve Kerrigan books by Jane Casey and the Invisible Library series by Genevieve Cogman - but they all blur into each other a bit. I suppose the books below are bolds because they didn't blend into the masses.
In fiction, I had a lot of fun with Eva Ibbotson this year, with my favourites being The Secret Countess and Madensky Square. I was also moved by Soldier Sailor, by Claire Kilroy. I also had a good time with The Ministry of Time, by Kaliane Bradley and Small Bomb at Dimperley, by Lissa Evans.
In non-fiction, I loved The Golden Mole, by Katherine Rundell, and a series of biographies: The Swimmer, Patrick Barkham (about Roger Deakin); Wifedom, Anna Finder (about Sonia Orwell), and The Man who Went into the West, by Byron Rogers (about R S Thomas). In memoir, I really liked My Good Bright Wolf, by Sarah Moss. In art history, I loved Thunderclap, by Laura Cumming and in archaeology, I got great enjoyment from X Marks the Spot, by Mike Pitts. For originality and weirdness, I have a soft spot for Ghosts of the British Museum, by Noah Angell.