Do you remember the last time you were enjoying your work while really focused and making massive progress? What were the emotions you were experiencing during this time? What beliefs did you have? What physical enviornment were you in? 

On the contrary, when you are not able to focus, what emotions do you experiece? What words and phrases do you say to yourself? What's your breathing pattern like? 

Bringing awareness to both of these scenarios will help you systemize your inspiration for focus!