merge
/a/, /c/, /jp/, and /vp/ into some anime board
/d/, /e/, /h/, and /u/ into a nsfw anime board
/f/ and /wsg/
/wg/ and /hr/
/o/ and /n/
/s/, /gif/, /aco/, and /hc/ into a porn board, or just delete them all
/t/ and /wsr/
/v/, /vg/, and /vr/
/cm/, /hm/, /lgbt/, and /y/ into /gay/ or delete it
/i/, /ic/, and /po/ into /art/
/gd/, /3/, and /p/ into a digital art board /da/
/out/ and /trv/
/sp/, /asp/
/tg/ and /toy/
keep
/b/, /g/, /k/, /m/, /r9k/, /s4s/, /adv/, /an/, /biz/, /ck/, /co/, /diy/, /fa/,
/fit/, /his/, /int/, /lit/, /mu/, /pol/, /sci/, /tv/, and /x/
and delete the rest
lower image resolution and reduce archives to 2/3 days