Having focus means that you don't optimize for the quick wins and immediate return on investment. More often than not, it means finding the right things to focus on.

• Press-gang a DRI (Directly Responsible Individual). When you're working with a cross-functional team of engineers and designers, lack of focus often develops from a lack of clear accountability. For your one target goal, hold one person on the product team directly responsible. As Gloria Lin of Flipboard says, "you don't have fifteen people worrying about the same things."
• Look inside the crystal ball. VP of Product at Facebook, Julie Zhou, recommends asking yourself, "If I could know anything in the world about how people are using my product, what would I want to know in order to tell me whether or not I was successful?" Work backwards from the customer to find something you can use as an approximate measure of success.
• Minimize interruptions. Make sure you and your team are ruthlessly protective of your own time. Everything, from Slack notifications to being tapped on the shoulder, can strip away focus. Heroku found that its top-performing engineers reported being interrupted 38% of the time compared to 76% of the time for bottom performers.