Stick to your topic
When writing, especially if it is an article or blog post, it isn’t hard to get distracted by related topics and ideas. But if someone has chosen to read about a certain topic, that is what they expect to read about.
Changing topics within a piece of business writing can confuse your readers and reduce your ‘expert’ status. This is especially the case if you are presenting a number of points about a topic (such as ’10 ways to save money’ or ‘tips for reducing water waste in your office’.)
As an example, I recently read an article listing various ways to sell a product. It started with market stalls, direct sales and wholesaling, but then went onto networking and advertising which are not sales methods although they can increase the number of sales made.
If you do want to include points that are not part of your original topic, change the topic to indicate the scope of the writing. Alternatively, write two or more pieces, each about a separate although related topic, instead of one piece on different topics.