Blog for the fun of it and show character. It is immaterial how many write about a particular subject, it is how you write the matters.
Add your personality - If you are writing on a particular topic, there are a number of people who will be writing on the same topic. So you need to add that specialty to your blog to make it look different and to allow your readers to take away something that the others are not offering.
Grow your Blog Organically. Don't force/ask anyone to share, follow or comment on blog. Just focus on promotion.
It was lovely knowing your takeaways from 2017. Now, let us hear your wishes for 2018. Aren't we all looking at the new year with love and hope? It is better to write down and then refer to it regularly if you really care about them.