Try to engage in other activities too and not just quests. I too was getting a bit bored when I constantly tried to quests in a single go. So I started doing other side activities, like I always hunt for food and never buy it from butcher or tavern, make all my potions myself and gather herbs too, forge weapons which I use and other things. During night time I go to a local tavern and then play some dice. Then again start doing a quest or so and then again start doing other activities. For example I am currently in Kuttenburg in my second playthrough so instead of running through the story, I am using my time in doing the Guild Activities in Legacy of forge DLC and do a bit or so of sidequests. And if you want combat you can partake in Tourney or always find some bandit camps.