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 i

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.