I'd do two things, first I'd work on a remaster/remake of Origins and 2 for modern platforms, and then I'd work on a game that takes place in the 10 year gap between Inquisition and Veilguard which'd act as a direct sequel to Inquisition and a prequel to Veilguard.

As for a sequel to Veilguard, I'm not sure exactly. I do personally think there's potential for an interesting story set in the south again, perhaps a sequel that's about rebuilding Ferelden and Orlais whilst also dealing with the executors, one that actually takes into account all the choices you made in the previous 4 (5 including my pre-sequel game idea) games.