The reasons for the weakening and decline of ancient Egypt?

The reason for the decline of Egypt was the weakening of the power of the Egyptian pharaohs. In addition, in the 1st millennium BC, other powerful states arose, which with their might captured the weakened Egypt. They were Assyrians, Persians and even Greeks. The last straw was the conquest of Egypt by the Romans in the 1st century BC. Despite the fact that Egypt under Ptolemy was able to renew its power. Nevertheless, by the end of the 1st century BC, he again weakened and fell into dependence.