Blogging should be less about immediately building an audience and more about gaining a greater individual understanding for the topics you blog about. You might also find that with each post, you learn something new about writing, style, etc and will grow embarrassed about your original posts. You will learn how to communicate better, write better and gain a greater understanding of your own opinions by blogging even if no one ever reads it.

For those interested, i wrote a blog post on this exact topic[1] about a year ago.

1: https://blog.benroux.me/untold-benefits-of-a-software-blog/