I would advise you to create a new topic in the forum, if you have specific ideas, or want to start a new initiative. Otherwise you could use the Search function to look for past topics on these subjects and find the people most interested in those fields. We also had a poll some time ago querying who was willing to contribute more of their time in helping the community evolve: Poll: Which Humane Tech topics would you like to spend your time on?
It is best if we have our discussions in public, out in the open, rather than send private messages, so that everyone is in the loop and anyone can contribute.