Create more pages and target 3 -4 keywords per page. This will help to promote 100 keywords. Suddenly you cant achieve all the keyword at a time. It will take time. Do more off page activities.
It's a simple yet lengthy process (I mean 100s of keywords at a time). But if you have all the resources, then you might be able to achieve a big part. How: 1. Write more quality content (optimized with your keywords---one keyword each page) 2. Do more link building (anchor text with keywords) 3. Create more web 2.0 properties (without the intention of using black or gray hat SEO) Doing this (with all your keywords), I am sure you'll be able to promote 100s of keywords. Good luck,
is this a one niche or multiple niches (health, auto, etc.) if you are looking to promote one nice and 100s of keywords it would be better to trying to promote 100s of keywords in multiple niches. It requires good planning and project management.