Can someone explain to me what this means?
Too many of your edits were rejected, try again in 7 days.
It seems rather straightforward. You've had 9 edit suggestions rejected. High rep users reviewing edit suggestions takes time, so the system temporarily stops accepting suggestions from people with a pattern of rejections. You should look into why those suggestions were rejected so you can hopefully stop making the same mistakes in the future
From the proposed FAQ post about edit suggestions: