Unfortunately I don't think there's anything else you could do. Unless you had a plugin like CoreProtect installed already then I'm afraid you can't reverse it. You can install that plugin to prevent this in the future though.
If you saved a backup on your server panel you can restore it. Make sure not to OP anyone you don't trust. You can report people here - https://forums.minehut.com/application/form/1-player-reports/
Minehut is always expanding their staff team. They can't always be everywhere though especially since there are exponentially more regular users than there are staff members. You can always make player reports here on the forums though. https://forums.minehut.com/application/form/1-player-reports/
You can report users here - https://forums.minehut.com/application/form/1-player-reports/
Some player servers allow hacks and modifications so if you want to report someone for that just talk to staff on that player server. Minehut doesn't deal with that type of thing.
Resetting your server will delete everything, restarting just stops and starts it again. Just make sure to save everything with /save-all before stopping your server.