How many tabs do you have open in your mind right now?
The one you really want to work on (AKA key priority) lost amongst many other tabs (distractions, or ‘urgent but not important’ activities?) Another one has a constant irritating audio track playing (AKA inner critic)? How about the other one replaying an old embarrassing video (AKA regret)?
Close all these mind-tabs and start afresh. Open just one tab at a time, the most important one that will move your most important project forward. And don’t open another one until you finish the task at hand.
When the monkey-mind wants to open other tabs, gently say, “Not today. Today is a day of focus, of creating, of progress”.