What was Greece like in the 10th 9th century BC?

In the 10-9th century BC, Greece was already under the control of the Dorians, who settled there in the 12th century BC. We can say that during that period of time Greece was in a state of transition, which was caused by a major war, which caused the decline of civilization. Already in the 8th century BC, the process of revival began. This is how the Hellenistic civilization arose, which became central in the history of ancient Greece.