This firewall project seems to be supported by a number of influential and rich people. It’s good that they are openly supporting such a project but the project in itself still needs to prove itself. For general public I’d say keep supporting the organisations that already exist and have shown their worth.
There’s no need to sacrifice yourself, such actions rarely lead to good results. Everyone has their own way to contribute, but historically some sort of organizing effort has always been necessary for regular people to wield power over their rulers. Organizing takes different shapes depending on your goal. But suppose your goal is to disrupt the US war machine.
Look for small ways in which you might be part of or adjacent to this machine. Does your workplace work with arms manufacturers or other infrastructure used in warfare? Is there a heavily complicit company in or near your neighbourhood? Does your city/municipality have contracts with complicit companies? These are all things you can organise against. A campaign starts with awareness. Stand with a sign next to a company building and talk to workers about how their employer is contributing to mass murder. Or organize a protest. Or do something else that better fits your qualities.
Maybe set up a petition and build your campaign around that. Talk to people in your environment to agitate them. Educate yourself so you can educate others. After and during the awareness stage you start to recruit other people who want to take action. Together you can build a plan to achieve your goals. This plan should create the pressure necessary to change policy or supply chains either through a worker strike, direct action, mass mobilisation or maybe something else.
Read about organizing tactics from the book secrets of a successful organizer (or another book about the topic)
There are so many ways in which you can organize it’s impossible for me to tell you what’s best for you to do. It all depends on your qualities and your surroundings. But you can at least try, and learn from your experience. No one person can change the current course of the US. The threat of mass organization is the only thing that scares the people in power into moving at least a little bit towards the demands of the people they rule over.
This answer is not super coherent since it’s such a broad topic but I just want to impress upon you that being a citizen of the world means to engage with the world and how it impacts you and how you impact it. With enough people you can topple governments, but with less you can still significantly impact supply chains and/or policy. If you do nothing we are guaranteed to lose. If we all do something and coordinate, we can collectively wield more power than the people in charge.
Do you actually care, that your labour and tax are used to commit the gravest horrors onto other people, or do you just pretend to care for virtue signaling? If it’s the former then there is much more you can do than vote every few years.
I hope that you will actually look at the sources that people gave you. It’s understandable that you are sceptical but it’s very important to learn the actual origin of NATO because it’s the first step of understanding that NATO has been a tool for imperialism and the suppression of leftists revolutions around the world since its inception