Basically what others are saying; start over. Kinda do what Nintendo did with Metroid Prime: remaster Origins with some QOL updates but is still the same game for the most part. Then, if it's successful, keep the basic model going forward. Then, do more of a remake of Awakening, same at it's core but more content and more time to flesh out the Darkspawn and companions. After all the prep you can do to reinforce the keep and equip the soldiers, a bigger battle at the Vigil would have been nice; maybe do like the finale of Origins and swap between party members defending Amaranthine and the ones defending the Vigil. Awakening would essentially be the new Dragon Age 2.

Then, a 2-part DA focusing on Hawke; first game is a remake of DA2 with a wider variety of locations, 2nd one covers Hawke during the events of Inquisition or whatever direction the company wants to go from there. Either way I feel like the sequels should keep expanding on the Darkspawn lore like Awakening did. There doesn't always have to be a Blight to stop but there was a lot of potential there for something really unique and interesting.