Hi,
Have you had a look at related topics your (prospectives) buyers are interested about? A blog offers great opportunities in writing about subjects that are not directly related to your business.
- E.x. are there any complementary products your visitors need in order to get their job done?
- What problems do people try to solve, when they search for your keywords?
- What results do they obtain when they use your product?
Sum up: It might be worth to broaden your keywords and go away from your value proposition only (don't be to product-centric) and focus on the entire customer problem.