You have convinced yourself that discipline is different from focus. It's not, it's one and the same. If you don't have focus, you don't have discipline. It's easy to procrastinate and do things you shouldn't focus on and convince yourself that you're doing work. It takes discipline or focus if you will to do what you don't want to do. Before you begin work, plan your day, make your plan visible, stick to the plan and don't move away from it. That's the strategy. Plan ahead.