Why it works
Clear directives reduce the mental energy required for the reader to decide what to do next. When the path is obvious, people are much more likely to follow it than if they must guess.
Example
Please reply with a simple yes if you are interested in a demo.
An illustration of the mechanism, not a template. Copied verbatim it stops being persuasion and starts being the pattern everyone else is already sending.
Is your sequence pulling this one?
Paste it in and find out which levers are working, which are missing, and which single zero is capping the whole message.