Since a lot of the things I would usually ask for have already been asked for, I'll add a few things that have not been requested.
1: An expansion with more zones, story, and all of the features that were cut due to time constraits.
2: More in game economy, political and societal related features and more ways to gather specific crafting materials, with out having to chase down specific mobs at specific levels, ways to help shape the course of the coming age and things the Inquisition can do to make the world a better place. (Merchant's and crafting guild with missions, resources to secure and unlock, farming guilds and various nobles, mayors and people with concerns etc)
3: More ways to impact the world with your decisions, such as rebuilding old defensive structures, building new community structures and other investments that would be of use to the Inquisition or customizing existing buildings. (Eg, repair the fortifications around redcliff and leave some kind of indication that this building was restored by the inquisition, build roads, repair or use farm lands, build fortresses that serve a specific function, etc)
4: Functional upgrade options for Skyhold, such as building upgrades, replacements and repositionings. (For buildings that didn't already exist and have cut-scenes / trigers tied to them. Cobble stone roads, npc housing, stables upgrades, full wall repairs, npc shops, trade wagons entering and leaving, npcs entering and leaving skyhold, etc) but enough options to turn Skyhold into a living Citidel or small City. (Essentially, ways to turn Skyhold into a city state)
5: Upgrades to the current cities in terms of size, reasons to visit etc. Along with more cities and locations around the world to visit. I wouldn't mind revisiting some of the DA: O / OA locations.