Search whether the affiliate programs you are registered with offer any product that could support and complement your writing. And otherwise search for programs that offer products or services that could fit in with your niche, or with the subject of that particular article, and try to get registered asap, so that your writing does not get delayed.

For this reason, you can see the importance sometimes to register with as many affiliate programs as you possibly can, so that when you are ready to write about a particular subject, all you have to do is obtain advertising tools from the program you are registered with to add to your post, such as links or banners.