While I know this is not a fix and we shouldn't have to do it as some will claim, will say it so hopefully the Original Poster can have fun again.
How about not using the best weapons and armour? How about debuffing yourself so the game is not so easy? What difficulty level are you playing? If not at max level how about increasing the difficulty level? I know for me, sometimes it's not an option because instead of the game becoming harder, it's just the enemies are becoming bullet sponges, and to me that is not making the game harder, but more tedious and less fun. Maybe for the Original Poster that would not be a problem.
How about limiting yourself to 2 or 3 weapons, 1 pistol, 1 rifle and a melee weapon. For your guns only have a handful of bullets. Say 200 rounds or what ever you would really cary in real life. How many stim pacs are you carrying? Maybe 10 or 5 the most.
If the game is so easy, how about starting a Dead is Dead now. I don't mean start over, but starting Now, play and if you die, game over. If you die once, the game is not easy then is it?
Other than that, I am not sure, how to make the game more fun or difficult with what we have on the Xbox One for now.