Carry some type of journal with you everywhere you go, including in your own house. And whenever you sit, even at the kitchen table, have your journal open and ready for you to scribble something in it.
Get into the habit of carrying around your journal everywhere you go.
And get into the habit of journaling whenever possible, even if it is just a fast minute here and there throughout the day, all day and night long.
Carry it around with you because you never know when an idea of something to journal pops into your mind.