Unavailable, nothing logged.
THE THREE CHECKS
Does cPanel load? If yes, the server is running. Does the domain resolve? If not, DNS or expiry. Does it work from mobile data? If yes, your address is blocked.
IF THE DOMAIN DOES NOT RESOLVE
Check the expiry date in WHOIS. An expired domain produces exactly this, and your data is untouched.
Open a ticket immediately; recovery becomes harder with time.
IF CPANEL LOADS AND THE SITE DOES NOT
Check whether the files are still present in File Manager.
Check cPanel > Metrics > Errors.
Check whether disk or inodes are full, which breaks things without a clear message.
IF NOTHING LOADS AT ALL
Check Client Area > Network Issues.
Check whether the account is suspended.
IF IT IS INTERMITTENT
Resource limits. Check Resource Usage for spikes matching the outages.
WHAT TO SEND US
The answers to the three checks, and the times it was unavailable.