Write something useful for yours reader. Share a relevant piece of information, an event update or a hack that makes a task simpler.
After completing your post, read it with a fresh eye from the perspective of a reader to check if you enjoy it or if it needs changes.
E-commerce bloggers can gradually choose to write curated content from other websites/blogs. That always helps because a buyer will generally not spend much time surfing. He/she will appreciate it if you provide most of what they are looking for.