What can a non-US citizen do? What can a US citizen do? I don't mean this in a sarcastic or confrontational manner at all, but it is a genuine enquiry - other

What can a non-US citizen do? What can a US citizen do? I don't mean this in a sarcastic or confrontational manner at all, but it is a genuine enquiry - other than raising awareness of such issues to the voting public and donating to foundations such as the EFF - what more can an average Joe do to prevent / reel back these reaches and abuses of power?