Google shake , About cloning sites

I have several sites, they all in the top 5 in google search result for about half year, but they all droped to page 4-5 yesterday. I did not change anything.

These sites are all similar over 90%, I don't know whether that's the reason? But they works fine in the last half year.

What should I do in the next days?

Thx.

 

They've probably outranked you.

 

I want to update the title ,content,and image path , Others need to be aware of ?