tl;dr: pharaoh Ramses II did great things but lived 90 years, outliving many of his sons, and soon after he died his kingdom fell into civil wars over successions and collapsed
For example, Ramses II's forensic report says he appears to have been a Lybian Berber.
The Greeks told a story about how there was a conflict between Danaus, the leader of Lybia, and his brother the Pharoh of Egypt who had fifty sons.
The single day Lybian/sea peoples war against Ramses II's successor has a lot in common with the single day battle Odysseus talks about going to against Egypt as soon as Troy fell, where he's taken captive and parties with the Pharoh until after seven years a "certain Phonecian" showed up and tries to ransom him to Lybia.
Seven years after that Lybian/sea peoples battle is when Amenmesse seized power from Seti II.
The account of Ramses III about the end of the 19th dynasty described fairly Phonecian elements like the city governors collectively ruling or "making the gods like men" - almost identical wording to the opening euhemerism of Sanchoniathon's Phonecian myths.
I suspect our understanding of the end of the 19th dynasty will be changing quite a bit over the next decade...