Since you are interested in continuous improvement, you will want to keep testing by changing one variable in your sales letter to see if you can improve response.
And you will be surprised by the results.
A recent test I did showed a major difference in results just by changing the headline.
I took my list and divided it into 3 equal groups and each of those groups received the same piece except I changed the headline slightly.
Would you believe one of the three pieces had a 200% difference over the other two?
So that means if I just guessed and picked the one I thought would work best, I’d be achieving less than 50% of the potential response.
By employing testing, every marketing method you do will work many times more than it would without testing.
To start testing you’ll need to find your “control”, this is the letter or approach that has consistently proven to be the best so far.