Do we lose everything after closing
No, there is no shop connected to you.
Edit to your edit. When you close a shop then everything is usually closed. Sometimes it’s better to put your shop on vacation mode for a while, you might decide to reopen it in a year or two.
@PixelBizarre: Has it been at least 90 days since your first sale? Have you met the order quantity and volume requirements during the applicable three month period? https://help.etsy.com/hc/en-us/articles/4403058372503-How-to-Become-a-Star-Seller?segment=selling