I’m sitting at my desk. I have one thing to do.
If that thing I have to do is on my desk and nothing else, it’s easier to focus because that’s all there is. Even if the task is difficult or boring, not having distractions increase my chances for success. By a lot.
My mom used to say a messy desk is a messy mind. Keeping the clutter off is a never-ending job, but luckily, almost entirely within anyone’s control.