While I am not a fan of cairn building, I do recognize the benefits of activities that promote mindfulness.
Cairn building does displace little creatures from their homes and can cause them injury without our even knowing it.
I just came across this group that may be a good fit for you. It is filled with people that will resonate with your message and can give you a bit of exposure.
It is called the Eco-Train and here's the link, https://discord.gg/GhXHU
RE: Bring a Little Balance Into Your Life