It'll be a very short book:
Get married (Huge Wedding) have baby, spend a fortune - mostly other people's money, on two renovations, although we didn't really want either of them. clothes, private jets, security etc.,
Get pissed off disillusioned because Kate's Queen Bee at Wimbledon and nobody cares about us trying to save the world. Blame the tabloids.
Go to South Africa with sycophantic buddy who really 'gets us' and encourages us to open up about our suffering but nobody gives a shit!
Take six weeks off to re-discover ourselves. Even more pissed off disillusioned because nobody gives a shit! Blame/sue the tabloids!
Announce big bombshell. We're flouncing off to Canada because it's part of the commonwealth so they're sure to love us there and some rich sucker has loaned us a multi-million pound mansion. Sayonara Frogmore Cottage.
Nobody gives a shit although HM did raise an eyebrow about Megxit as she put her cheque book back in the drawer. Just goes to show how badly we've been treated by the toxic RF.
Move to LA because it was always in my plan of Coronavirus which will give us a chance to be spotted doing Good Works.
Blame the media for everything.
THE END
Unless Disney want to make a film about us in which case we'll work on Finding Freedom II