If you’re selling a $19 product, write extra benefits as though you are selling a $39 product
If you are selling a $39 product, provide more justifications as though the product is $97
If you are selling a $197 product, over deliver the proof elements as though you are selling a $497 product.
In other words, go the extra mile to build a stronger and more convincing argument why your product is worth more than what it is selling for.
Yes, sounds kiasu. But from my experience, overproofing, overdelivering has seldom hurt conversions but improve copy to have a longer run rate.
The challenge is does the copywriter has the mental capacity to go further after all the writing.