Now or Never
Inspiration is perishable. The most important thing is to act when inspiration strikes.
You will have doubts about whether what you are creating is good or not. But don't let those doubts stop you from creating anyways.
The more you act the more inspiration you will create for yourself. The more momentum you will generate for yourself.
It's hard to plan to write the best blog post in your first take. But it's easy to write the worst one. Make mistakes. Write a bad blog post.
Put it out there publicly. If your motivation to create is pure your work will naturally get better.