Thanks for your support and messages.
I don't know if there's a chance to get back my traffic. The May Update hit me badly, on the other hand, I'm considering that it would be a manual penalty; if so, there's no hope for me. But, Google is indexing my fresh content fastly and showing my content on Search's Top Stories section. What is your opinion? Is there any possibility of a manual penalty?
Now, a new feeling inside me is growing and saying that 'move on and start a new project.' So, I guess, that's what I'm gonna do. The current situation is like losing your little baby. I did it once, I will do it once again. I have no doubt about it. But, it's not fair Google. It's just not fair.
PS: Sorry for my poor English. It's not my first language.
I don't think it's a manual penalty because a tonne of people got hit, some sites even clean 100% whitehat. It was just so random except for huge authority websites getting a huge boost and some no name off the wall site, but for everyone else, they mostly got hit.
I would just leave the site alone and continue doing what you are doing or making another backup site. That's what I did. I created another backup site back in February and have 30 articles on it, but it's still stuck in the fucking sandbox because again due to this POS google. The site gets more traffic from bing/yahoo/baidu/duckduckgo then google.