The Minoan civilisation in Greece, around 2,500 BCE, developed huge technological advancements, including fully operational water and sewage systems, complete with flushing toilets. This would be around 3,000 years before one was invented in England.
Minoan Greece was also a sea power. They had huge fleets of ships, which meant they did a lot of exploration. They also built one of the biggest trade networks in the world, reaching as far as Egypt, Cyprus, Canaan, Syria, the Iberian Peninsula (modern-day Spain and Portugal), the Levantine coast, Anatolia and Mesopotamia (modern-day Turkey, Israel and Iraq).
A volcano eruption on a nearby island, which caused a tsunami, possibly destroyed their sea power and left them vulnerable, which is why most of their technology was lost.
The Late Bronze Age Collapse a few centuries later led to the simultaneous destruction of advanced civilisations in Greece, Egypt, the Near East, Asia Minor, North Africa, Caucasus, Balkans and the Eastern Mediterranean. This caused a dark age across two continents which created isolated village cultures, and is the reason most of their advancements were lost.
The notion that technology can only advance is some white nonsense.