Why did the Phoenicians need colonies?

The Phoenicians lived mainly on the territory of the modern state of Lebanon and the period of the heyday of their state can be considered the first half of the 1st millennium BC. Their civilization differed from neighboring Mesopotamia and Egypt in the important role of foreign trade in the economy. There was less fertile land, there was no need to build irrigation facilities, so the Phoenicians were engaged in sea trade and created colonies on the shores of the Mediterranean Sea, they were exported or, conversely, imported from there. It could have been sold from Phenicia itself in Mesopotamia.