In order for our support to be able to help you we need to know what you see. Saying "I could not restore it" doesn't give us any clues. Did you get an error message while restoring? Did the restore point no longer exist? Did the restore go through but for some reason you believe it didn't work? We cannot know unless you tell us: we can't read your mind. That's what Dale means. We do try to help everyone, to the degree that this is humanly feasible. This requires you to give us something to help you with.
Further to that – and trying to read your mind – you seem to be trying to restore a System Restore Point to restore your main menu items. Or your article Categories. I am not sure as your ticket makes no sense to anyone reading it. Either of these has zero chance of working. System Restore Points are used to restore an extension. The menu item and categories data are part of your site's data, not part of the menu extension you are using. This is basic Joomla! knowledge. Someone who's using Joomla! for over three years (judging by your subscription history) should have known that already. As a result you cannot, of course, restore your menu items by restoring a System Restore Point. You need to restore a full site backup.
Please remember what I've written in the documentation which you said you have read: the System Restore Points is just an attempt for a quick fix in case the update of an extension breaks something on your site's front-end. It is not meant as a substitute for full site restoration and we recommend you to always take full site backups before doing major changes to your site.
I am sorry that you misjudged the intentions of our support staff based on the casual, informal tone that we have chosen to adopt in this support ticket system. We only wanted to help you. Just like the other times you used our support you did not intend on being helped. We can't fix that, sorry.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!