That won't help. I can get engrossed in a book/film/videogame I like. Most day-to-day task are not as interesting though. The problem is being able to concentrate on an activity that doesn't get you instant gratification.

Nothing will help if you don't put in the effort. You need to regain dopamine sensitivity and the way to do that is going on a dopamine diet. If you keep gorging on easy dopamine, it can only get worse.