The two recent series that stick out for me are IKS Gorkon by Keith R.A. DeCandido and Typhon Pact.
If you liked the Klingon-centric episodes of DS9 and were left wanting more, the Gorkon series fills that void.
Typhon Pact salvages the Ezri Dax character, has a lot of good Riker bits, and features "the Romulan Star Empire, the Breen Confederacy, the Tholian Assembly, the Gorn Hegemony, [&] the Tzenkethi."
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.)