You are completely right, our ability to focus in digital age is decreasing everyday. Collecting ones attention toward one activity seems difficult. But yes you can bring your attention back by focusing on one thing at a time, writing it down would be of much help too. One thing I would like to add; focus can be enhanced by eliminating what is not at the hand right know. By time and with discipline we can restore our lost ability of concentration.

Another method to calm the monkey mind that had become addicted to over-stimulation and regain its focus is bringing awareness to it. Being conscious of what your mind is engaged with at every moment bring it to a quieter state.

I use such methods to focus more on writing, and I am getting better though it is not yet my career. :)