Google Fifth Page Filter Pls Help Me

Hello everyone,
i have 20 blog web sites about a lot of subject (game,health,magazine etc.)
some web sites are new and some are old (2 months -3 years)
but suddenly something happened, all of my web sites are falling down
visitors about 10.000-20.0000 to >> 100-200
and i check this problem i found a one thing..
All the words in the first place in big G my new place is 5th page..
i researched on internet this problem and i found it called fifth page filter (like sandbox but it's not sandbox)
so i tried somethings to get out from this..
i changed who informations
i changed hosting company
i changed meta tags and theme (wordpress)
but i cant get out
final solution is blackhatworld..can you tell me your advice to get out from the filter ? thanks and regards

note: sorry for my english..and sorry if i open this subject to wrong place..

Just keep link building bud. Be consistent, convince them it's natural and you'll be right back where you started, if not higher, in no time.

thank you for your advices