This morning I went through my Kindle and discovered, somewhat to my horror, that I have no fewer than 78 books on there that I haven't yet read (including the handful that I've started but not finished). Plus 13 hard-copy books piled up by the bed; 16 on the shelf downstairs; and 10-20 short-story magazines also on the Kindle. (We will leave aside the matter of the hundred-odd samples on the Kindle which act as a sort of 'perhaps I would like to read this' list.)
So. New plan for 2018 reading: get through all of those (or officially DNF them) before I buy anything else new (with exceptions for new releases of series I'm already following). Having just tidied up my Goodreads records from last year, that comes out at 175 books (which still misses a few from the library and an awful lot of fic). So 107 books plus magazines should keep me going til the summer. So far I've read 10 books in 2018, but several of those were novellas or shorter; also quite a few of the TBR pile have stayed as TBR for a while because I anticipate them being slightly harder going.
Recommended so far from 2018 reading: the Belladonna University novellas by Tansy Rayner Roberts (Fake Geek Girl, Unmagical Boy Story, and The Bromancers, all fluffy Australian magic college stories with a big dollop of geek-culture), and Dreadnought by April Daniels (trans superhero YA).