I did a stupidity. Using find command I deleted near 500GB of files.
is there a REAL way to recover it?
In general, no, there's no easy way to undelete files on most Unix filesystems. For specific filetypes (such as photos), your prospects are a little better; see this document, for example.
This document talks about using the debugfs
command to recover deleted files, but I don't know if this is applicable to ext4
(and as the article says, there's no guarantee of success).