We should add some new boards here how about a otaku culture board for discussing otaku culture and other types of otaku stuff a NEET/hikikomori board for people who don't work or go to school and stay at home and live with their parents a Japan general discussion board to discuss Japan and Japanese culture.
don't forget Japan/General and 2D/Random
Those sound more like boards for imageboards not textboards.
I think some of these are OK ideas, but more as replacements for existing boards than as new ones in addition to them.
Anime and Manga could be rolled into a single 'Japanese pop culture' board. I don't think otaku culture and general Japanese culture deserve separate boards. If they were two boards, the latter would probably be dead or only contain threads that overlap with other boards (like Fashion and Music.)
There'd be an argument to roll everything under the Culture header (and possibly Fashion, Food and Hobbies as well) into just one board called something like Culture or Media or Hobbies, not country specific.
Personal Issues is effectively the NEET/hikikomori board already except for rare visits by normies. IAA was one too long ago but turned into general textboard & imageboard discussion at some point. NEET/hikikomori posts may still be on topic there.