Sales copywriting is not only writing the copy, that's only the frontend. The rest 80% to even 90% is research,  drafting tons of copies you don't like till you achieve what you wanted and what works.

An Unordinary Interview with an Unordinary Copywriter Who Hides Away Just to Avoid Getting Flooded with Clients

Kristijan Gligoroski: If you don't have a great headline, it's useless to write ten thousand words of content because nobody would read it.

Find out more about the interview and this topic on venturemastery.co:

https://www.venturemastery.co/interviews/mind-blowing-sales-copywriting-secrets-you-never-considered-they-existed/