What is the best way to reach businesses for a product like this ?

Organic promotion is the best way to achieve long term growth if your have a quality product or brand. However I found small to medium online businesses doesn't prefer this over inorganic ad marketing. And the reason certainly is slow sales spike and growth in case of organic marketing.

In retrospect, I found that most of the online medium to big brands always prefer to have long time business partners for mutual growth in sales and goodwill of their brands.

Keeping this fact in mind I found finding the best business growth partners is the best way to cross promote your product and services through other brands.

I made the landing page and everything is ready. I am trying to reach companies now. Screen shot is attached to give you the basic understanding of the idea.

My question is how can I reach small, medium and big online businesses to sign up for this ?