system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Elon Musk wants to build a colony on Mars, what can I, as an ordinary guy with no multi-billion dollar fortune or degree in engineering, do to get involved with the SpaceX project, and others like it and be a part of humanity's first steps in living on another world?
gpt
I'd start by researching the hell out of Elon Musk and the project with an eye to understanding the business and political communities that will affect and drive it. Look at its supporters and its critics to get a well-rounded perspective. Most responses to your ELI5 question will likely not know the guts of it beyond what has been publicly announced, and that's not enough to base a decision on. Dive in, learn more, and understand what you're on about as much as possible.

The next step is to measure yourself against your own potential involvement level, which could range from "directly involved" (i.e. actually employed in the cause) to "interested and not really committed" (i.e. tweeting about it once in a while). 

If the former, are you brilliant, healthy, a workaholic, the right nationality? Are you willing to surrender your existence on Earth and even gamble with your life itself? Then perhaps, just perhaps, you could actually be a colonist. But instead are you more one-dimensional in your skills and would make a high-quality parts manufacturing worker, an astounding accountant, or an efficient janitor? Then perhaps you could help indirectly by building the parts or doing the books or sweeping the floors (do not trivialize the importance of this role!) at either Musk's company or one of its principal suppliers. 

If the latter, then join the other millions and support the concept where you can in the natural dialogue you have with your internet and real-life communities. If you live in the right areas, attend promotional events and even help to organize them if there's a way to (e.g. will Musk be at an SF convention, and do they accept volunteers?).

It's really about how firmly you believe and support, and how much you're capable and willing to do to yourself for the cause.