What you could have done better is lower your CPC to a Max of $0.18 for a $3 dollar payout, then you could have been split testing the images and looking for similar ad text on other advertisements on FB to try and get a higher CTR, which would eventually give you a lower CPC to work with.
In my opinion your spending too high of a CPC out of the gates on a lower paying offer, even if FB suggests a CPC of $0.28 don't listen to them, learn the math....
Like math? You better learn to.
Advertising is one of the safest methods of making money since you can track literally everything, just gotta learn and practise with all the data.