DeCandido’s ‘A Singlular Destiny’ follows directly from Mack’s Destiny Trilogy. Then, the main Relauch novelverse moves through the Typhon Pact books.
Ezri Dax starts evolving as she integrates Dax’s former hosts and wrangles them in some earlier DS9 books. But she really takes off as one of the 4 hero captains of Destiny.
For those who want to start the Relaunch books from some of the deep political turning points, Mack’s two books in the ‘Time to…’ series are the key ones. They take place between the TNG movies Insurrection and Nemesis, putting dynamics in play that run right up to the end of the Relaunch novelverse in Coda.
(And yes I’m still grieving the end of the Relauch alternate timeline.)