One major suggestion I can give that can change your entire outlook of the game is to realize that DAI is different than its predecessors in that you play both a PC and develop an Inquisition rather than just do random stuff with a character.
Treat the Inquisition as its own entity. Everything you do is reflected on the Inquisition so approach every quest with that mindset.
Every quest, no matter how seemingly trivial, will incrementally make you and your Inquisition stronger and grow in power and influence figuratively and literally.
Many of those quests tie the zone together and end up rewarding you and your Inquisition unexpectedly with loot, agents, lore, etc..
Use the war table mechanic and read the content carefully, and don't select an approach based on which advisor is currently available but rather on which approach you feel is best.
Basically, choose the quests, events, actions, and dialogue that not only reflect your own character but the organization you want to develop.
That's all I can say without venturing into spoilers.