It's answering the average person
With no context, the safest answer is the one that's true for most people. That's the definition of generic.
One or two lines about your situation change who it's answering: “I run a two-person bakery in a small town; most sales are weekend walk-ins.”
It doesn't know the audience
An email to your boss, a 10-year-old and an investor should all sound different. If you don't say who will read it, you get the middle of all three.
Name the reader and what they care about.
It doesn't know what good looks like
Say the goal, not just the topic: “so they book a call”, “so a new hire can follow it on day one”.
If you have an example you like, paste it and say “match this tone”.
It needs facts only you have
Numbers, names, prices, deadlines, what you've already tried. These are what make an answer yours.
If you don't know them yet, leave a clear blank like [INSERT price] rather than letting the model invent one.
Ask it to ask you
When you're not sure what to include, end your prompt with: “Before you answer, ask me up to three questions about anything you need to know.” You'll answer three quick questions and get a far more specific result.