Deleted Pages / Can't Undo

So I deleted pages so that I could add new ones on the trial version and now it won’t let me undo that or add new ones even though I deleted some…

Here is my site Read-Only:

Well, the only way to undo deleted pages is to roll back to the previous version of the site using the backups tab in your project settings. But free plan has a limit to backups so it may not be an option, check it out, maybe the necessary backup is there.