I've been doing a big mistake (sending 200 status for 404 pages : Soft 404).  

I didn't know what to do so I removed all the website from google search and I wanted to restart from scratch, pretty stupid decision.  

After that I fixed something in my script and my 404 pages send 404 header now.
and recovered all the links that I had previously deleted.
I've also submitted new sitemaps.  

The problem I'm getting is that my ranking dropped dramatically.
![enter image description here](https://i.stack.imgur.com/7rLXC.png)
How can I recover from this huge fall ?

Do you see that I'm actually recovering ?