After I beat all the levels/quests for Dragon Age: Inquisition, can I still go onto THE SAME save file and beat monsters/bosses and things.?

Put Sera in your party and do the quest to find the Red Jenny caches. She will gain approval for each one you find. If that doesn't do it, then following Hawk's questline you should: Recruit the wardens, execute Erimond, and sentence Ser Ruth to the deep roads.

All together that should be enough to trigger her quest.

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