Website stopped & 503 Service Unavailable

All websites have stopped and are not associated with domains and when you open the domain it appears
“This site can’t be reached”

And when you click on “Preview” it appears
“503 Service Unavailable”

The hosting subscription is new (3 months) and it was working without any modification in the settings


“The hosting subscription”, if you purchased cyberpanel from a provider that automatically installed it for you, like hostinger, contact their support.