It's a bit of a long story...
Illuminated was a service that was offered until 2015 as an upgrade to free hosting. In 2015, the option was removed and could not be purchased anymore. This means that all illuminated accounts would be reverted back into regular hosting accounts after the last renewal in 2015.
The illuminated upgrade was then left in limbo. The service wasn't offered, it wasn't billed, but the upgrades were never taken back, and the users were never moved to a regular free server.
At the end of 2019, x10 switched from cPanel to DirectAdmin. There was no longer an illuminated upgrade in 2019, so these accounts were treated the same as free accounts. In the transfer process, the illuminated users were assigned a new server just like everyone else. But, illuminated users weren't logging in like free users are required. So the new accounts for users that were formerly illuminated users were suspended if the user didn't log in
TLDR; illuminated was stopped in 2015 and your account was deleted because you didn't log in every 30 days like a regular non-illuminated user
However, as you can see, the files are not gone. So, an administrator will have to recover them for you and get them back onto your new DirectAdmin account. I'm requesting someone look into this for you.