Hi Stumpy,
I replied to your email, but it was returned as undelivered with a message stating that your email address is invalid ("Recipient address rejected: User unknown"), so I'm replying here on qubes-users. 
Stumpy asked a great question about how folks can contribute aside from donating and writing code.
Thanks for asking! We actually have a list of such ways right here:
Many items on this list don't require any money or programming knowledge. In particular, it's always helpful to test new releases and updates:
The just-released 4.0.4-rc1 is a great opportunity to do that:
However, individual package updates are also very important, and they often don't receive as much feedback as they need:
Thank you for your willingness to contribute!