I believe you misunderstand how dopamine works.[1] What you're talking about is called self-discipline in English and has value but doesn't need pseudoscience to support it.
1. https://neuwritesd.org/2017/09/28/dopamine-is-not-your-brain...
"Dopamine fasting" is not a literal or scientific term, its not pseudoscientific either. It merely describes the process (perhaps incorrectly) of imposing some challenge to impulsive behaviours which is a perfectly acceptable way to help break these habitual behaviors, neurologically speaking that is perfectly sound, and consistent with scientific insight into this area. People often misunderstand and apply the overly simplistic "dopamine bad" mentality and think it's somehow about volume of dopamine which is laughably incorrrect for such a complex and nuanced process.
But critics can't see the woods for the trees with this one.
Say you feel the urge to play another round of a video game. You tell yourself "No, make a break". Now your brain replies "Ok, then let's eat some chocolate". You reply "No, let's not eat chocolate either". Now your brain replies "What? You said take a break from the GAME! Why not chocolate? Ok, then lets drink a coffee". Now you reply "We take a break from dopamine! No game, chocolate, coffee, beer etc! You understand?". Your brain "Damn. Ok. Grumble. Grumble.".
Then later in the day:
Your Brain: "I feel so good today. I wonder why?"