Relax. It’s hard to be inspired after a hard day at work. You need to empty your mind of the daily stresses and worries relating to your own life. Writing a substantial work requires you to live in the imaginary world you create every time you write. You have to leave the real world behind when you upload this pretend universe into your mind. That’s why you need to relax in order to absorb yourself completely in your story. Inspiration will then come more easily.