The Perfect Pitch?

There is a niche of copywriters, they have lists of effective tested words to use for example.
And also formats to use etc.
A big marketing tactics that's old as time goes something like pain-resolve

Are you having this problem? And it really hurts? Like really? Your having this and that... Look no more, we have solved it for you! Interducing X, that solve Y, my doing Z.

(This is a long version to explain, can be short versioned to 10 words..)

Other way to think:

1. Identify with the customer first - who is he? What pains him? Where is he at in the process?
2. How are you solving his pain.

There is also a less effective selling pleasure way.

It's all under marketing, human behaviour (behaviour economics) and copy writing is the most specific

Also use their words as part of identifying with them not yours

It's hard to say without knowing more specifics, but who are you trying to get the attention of? What age group/education level/socioeconomic background? What are they most likely to respond to? Think about things from their perspective - ask yourself why you would want to use it if you were them.
Are they busy people - will your product save them time? Are they broke - will you save them money? Do they have a lot of money - will your product raise their social status in some way?