Advice on promoting a contest

Does anyone have advice on creative ways to promote giveaways on a blog? I’m having a contest this week and I’ve been disappointed in the number of entries. https://uponamidnightdreary.com/?p=6003 (all someone has to do to enter is leave a comment). I’ve posted several times on my facebook page and I added the contest to contestgirl.com and prizey.net. Does anyone have other suggestions?