Having read all the comments I think I should shift my focus from creating such a blog to developing my personal professional brand in another way. I see now I should rethink my strategy. Thanks for all your thoughts, I really appreciate it!
Don't worry about "developing your personal professional brand" - just work. Stop trying to be strategic, and instead spend your time actually doing freelance work for money, which you need right now. Then, later, you won't have to develop a brand, because it will have happened by itself ("I'm the guy who did this great work for this long list of clients").