Why Conversion Rate Should be Your Number one Priority in Facebook Ads Optimization

You can't control CPC of the platform no matter how good you are in media buying.

Facebook assigns auction ranking of your ad based on Estimated Action rate

Per Facebook it says Estimated Action rate is "the probability that showing an ad to a person leads to that desired outcome of the advertiser"

IT simplifies that having a better conversion rate will most likely fix all of your ad problems.