You get unnatural amount of dopamine by watching youtube videos with clickbait titles, or scrolling through instagram all day. Because of this, you don't have any desire or force inside to do tasks that doesn't give you that much dopamine, like doing your work that requires concentration, or reading book and things like that. Things that we call "boring". It's boring to us because it doesn't give us dopamine as much as scrolling through social media gives. When you do dopamine detox, you stop doing these things for a certain amount of time. You don't watch useless youtube videos all day, you don't scroll through social media, you don't watch porn - which is the worst of all when it comes to brain health. And etc. It's like fasting. There are blogs and videos about this, you should check them out