I agree with you but we need more firepower 
And you all guys are our canonballs.
You have many ways and the post mentioned by @davidep above is full of examples:
- talking about NethServer on your forums, mailing list
- mentioning NethServer and suggest it to people on your social network
- sharing posts or inviting others here
- writing a blog post or guide about NethServer or any specific module (like the Firewall)
- speaking at conferences or meetups
I can do some of the work but it’s up to you to boost the message!