You should blog to document
The blog isn't about writing clever posts or writing clickbaity titles to earn ad revenues.
You should be documenting what you are doing and what you are working.
Do something interesting and write about it on your blog.
Interesting activity can be anything, that you love
Like I am writing about the progress of my course.
Blog to document
What happens when you blog?
They are more connected to your story and to yourself
You just don't have a big body of work as a result of your project. But something in between too. Like moments and hard lessons, you learned along the way.