What is a good strategy for selling a single idea instead of a recurrent service?

Sometimes you person a bully thought for making thing personification mightiness want to bargain but it’s very peculiar and you tin envision it being done possibly 1-5 times.

What is simply a bully strategy arsenic a freelancer for benignant of pitching aliases advertizing a benignant of “suggested project”? It’s expected to beryllium thing personification wants, truthful they want to salary for it.