Traffic Plan for Niche Adult Site

I have a blog that has been built from the ground up with tons of niche adult bondage content. Currently, there are about 1,500 posts with about 1,300 videos and thousands of images. The blog was doing well in the search engines until a few months ago when its ranking in Google dropped suddenly. I need a solid plan of action to come back better than ever with a massive amount of targeted high quality traffic, preferably not dependent on finicky search engines. This could include well-placed banners and links, video marketing, forums, etc. My near-term target is to achieve 10-50K unique visitors per day, primarily from tier 1 countries. From there I want to expand to over 100K uniques per day. If you have solid experience that proves you know how to quickly and economically achieve these kinds of results for niche adult properties, I welcome your bid. If you can't back up your claims, however, please do not bother bidding.