So, you’re down to the writing. To begin I tend to think in terms of an audience, in my case Boston startup folks struggling with the kinds of strategic marketing and communications issues startups struggle with. Then I try to reflect on the experiences/thoughts/stories in my own life from the past week that might be worth sharing with those people, in a way that might contribute something of interest, or even of use.
Consider viewing your life this way: Internalize a habit > Learn a new skill > Create a prototype > Self-reflection > Experiment > Learn another skill. Or something similar. Your growth will be at least 3x faster than your peers. You can achieve so much more.