Ok, I'll just make it short as I can.

William survived the pizzeria sim fire, and he was the only survivor. He woke up and looked around, mourning his dead family. He needed to get out of the suit, and did so indeed. He couldn't be a walking corpse though, so he took parts from his daughter's now burnt prison and some from Michael's suit and the tubes of metal inside of him.

then he buried elizabeth's skeleton and walked around the city, got shot by a cop, taken to the pizzaplex, blah blah blah, got snatched by evan/the blob

But then he was in paradise. He was sitting in the grass. With his (alive) children. then it became a soul stone ahh moment with cassidy and william's kids then he escaped his brain

And then he died again. In every way he had died before.

Then he became The Glitchtrap, and passed through the digital realm as M.X.E.S.