It is important to make a new post most days to your WordPress site. This is what makes WordPress sites’ Google rankings so good, they always have fresh content. Make sure yours does, too. This is something you need to do every day. Get in the habit of doing it at the same time each day.
Make your post short and snappy. Write in an informal style, but write you MUST.
If you feel you need help writing posts then check out this article about blog posts.