Sorry about what happened, Minehut can't do anything about this as you or someone else gave server operator to them. You can report the user who griefed it if you have valid video evidence of it. Make sure to put it in the report area.
I suggest looking at the plugins website and maybe joining their discord to get support on how to do it. Also, you could watch a YouTube tutorial revolving around the plugin.
To do this you need a custom island Skript. Otherwise you would need some type of custom teams Skript to add on with the plugin etc. You can't do this with a plugin as you would have to save it as a variable.
Make sure to give permission nodes to the default group. You can view the essentials permissions here. Also, keep in mind you need a permission managing plugin.
Permissions: https://essinfo.xeya.me/permissions.html
This currently isn't a feature and there is nothing you can do. However, backups on Minehut are coming out soon! Sorry about your data loss. Use /save-all before shutting down the server to save all progress.
Currently you can't purchase or have a server named longer than 10 characters. That would be cool though if paid plans included different name lengths etc. Try leaving this in suggestions area!