Even the joys of Harry Potter passed him by!
It's funny you mention HP! My eldest (DD) read & loved them all; my two DSs initial books only & reluctantly - too long, too involved (character-wise). I then realised I don't actually love HP myself! I am not a fantasy fan, and actually (grown adult & all!) I found some parts scary!
I know one can't force them to read but I will always believe that engaging with anything written - even the sports sections of the paper! - yields so much for overall development, life skills, comprehension (and in my work at third level it's borne out).
It's an ongoing challenge to try & find books they might enjoy!
In my own family, 3 of the 4 of us read voraciously (all before screens which helped), my youngest DB did not. As an adult he still rarely reads books, especially fiction, but he reads multiple newspapers & opinion pieces & is incredibly well-informed especially on politics & international affairs. So I guess it works out!
I might now give Adrian Mole a go!