You can vote in government elections, you can vote with your wallet by supporting business that better support privacy, you can vote with your wallet form opting out from business models that make privacy impossible and you can communicate your views to others.
Democracy has always fared better when the public discourse was contributing. Businesses have always looked at their bottom lines first.
For example, I have three options for an ISP: Comcast, the local Telco and an old-school ISP. I go with the old-school ISP despite that I can only get 3MB DSL on my line and it costs more than Comcast. I do this because 3MB is enough for my needs. They don't filter any ports, they give me a static IP address and let me run any server I damn well please, they let me max out the line 24/7, they answer their phone in minutes with a competent tech when I call and I don't support a business who's hostile towards me. Three Mb/s is enough to stream SD, download HD for offline viewing, patch giant computer games overnight and send my backup data offsite. Yes, it's not as fast as 30 MB/s that Comcast offers me, but the more money they have to advance an agenda that harms most of the people in this country.
I'm just one persona and I am sure my $100 a month Comcast doesn't see does little, but if there were 100 million of me? That would send a message. Same goes for voting. Same goes for expressing what I do and why I do it.