Hello,
You can just reset all local changes and you will get all the cards back. They will be found in the #AK_Step2_V12 tag
To do so:
Please try resetting your local changes. To do this:
Go to browse in your Anki → at the top click on ankihub addon tab → press reset all local changes
This will restore everything to what AnkiHub has unless you have specifically protected those fields
If you added things to the text/extra and those are not protected, then they will be overwritten.
To see how to protect those fields, see this post: Protecting Fields and Tags