I have such a low budget on my promoted listings, I'm just going to keep them the same. I have it set low as a "just in case" and not really depending on them as a main source of flow of traffic. (In the past for me I tried it and failed).
For me, I use Instagram and Twitter for promotion. I have good luck with those two. But you have to use them daily, and be social on them (like people's photos, comment on their photos, retweet tweets, etc).
I'm going to start trying to working on my facebook page again. Below is the thread that I started asking for Facebook advice if your interested.
https://www.etsy.com/teams/5002/etsy-success/discuss/17228491/page/2