The problem of focus is a problem of motivation, you could band aid it by doing this but if you can’t solve why you are not drawn to the task you will always have this issue.
Can you focus hours playing a good game? Yes? Then why is this game innately making you focus and your task isn’t? Maybe it can be looked at differently? Can it be fixed?
I often think this to myself. Why is it when I start on something "new and shiny" I get this burst of enthusiasm and motivation, but when it loses its novelty it becomes hard work?
I keep trying to think if there is some way I can trick my brain into thinking things are always interesting and novel so that I can reliably get into a flow state and feel happier about what I'm doing.
Can you focus hours playing a good game? Yes? Then why is this game innately making you focus and your task isn’t? Maybe it can be looked at differently? Can it be fixed?