Thin content with little or no added value

Hi , my website(wordpress) is about 5 months old.
Is a cpa black hat niches website.
I made in the last 5 months about 200 backlinks
Suddenly yesterday i saw all my ranked pages disappeared from google and also few backlinks.
I looked in google webmaster and saw this message:

" Thin content with little or no added value "

I can kind of understand why they wrote it ,
My blog posts is kind of duplicate my own previous post , it's like 30% duplicate and 70% new.
but the pattern is pretty the same , it's necessary.
I saw a lot of blogs like mine and their content is much more thin than mine and they still ranked.
So who's know he can 100% solve me problem please contact me.