This document summarizes part 3 of a 4 part case study about using Facebook ads to generate leads for a website. It discusses how the author optimized a Facebook ads campaign for their website buildingsocialproof.com to lower the cost per email subscriber from $10 to $2.38 by changing the campaign optimization goal to conversions, modifying ad creative based on feedback, and adding women back to the targeted audiences. The author aims to get the cost per subscriber below $1 with further optimizations in upcoming weeks.