Some of the websites you listed replied with exact reasons, such as they have a policy of responding only to contact from certain states or countries. Looking at the whole list, I would guess that they do not find your solicitation interesting for simple and practical reasons. This is the way of life and business - people have developed certain ways of conducting business (and life) and don't respond quickly or easily to different ideas from outsiders.
It appears you have an idea (a product?) which you think might be worth something to others. Congratulations. You are now an entrepreneur! Unfortunately perhaps, promoting and selling something new does not always succeed easily. In fact, I would have to say that it _never_ succeeds easily. In the U.S. we have many stories of people who have succeeded at something only after trying many hundreds of times, looking for the right approach, the right product, the right idea. I think this is probably true everywhere.
You have contacted certain people, organizations, which seemed might be interested. I cannot suggest a better way - you are doing what must be done. Perhaps if you find people willing to discuss ideas with you, try to encourage conversations see what things you can learn. New approaches might occur to you from this talk, maybe new names, new applications. I have done what you're doing only very briefly and I found it quite difficult. I believe that people can usually "succeed" provided they simply do _not_ stop pushing, trying. However, I also believe that the ideas and plans that do succeed very often do not look much like the originals - one needs to keep eyes open and change to discover what works. What you are doing here is known as "cold calling" - trying to sell or promote something by contacting people without ever having any prior connection with them at all. It's a truly difficult task but it can be learned. Once learned, the skill is valuable - more valuable for business than almost anything else one might learn.
I can only suggest you consider beginning your conversations by asking questions rather than just telling your story. Try to get to know the people while expressing your own plans. Networking. It helps, I think, to understand yourself and how your feelings and strengths might relate to your plans. For example, if you hate talking to people but you have good technical skills, you may need to find a partner with people skills. Or if you know, for example, logging very very well it will be easier for you to "connect" with other people who know logging because they will be able to tell that your are "for real". There is a very widely known book in this country titled "How to Win Friends and Influence People", written 70 years ago. It tells it like it is and gives many good ideas for how to promote and sell. I think you can find it easily and it might be helpful; it describes a way to approach people with the best chance of success and proper behavior. The author, Dale Carnegie, was very successful.
The only other thing I can say is "market research". Learn what's out there and how you can fit in and enhance things.