Block roads in protest, or show up at Queens Park to yell and scream while holding angry written signs, or organize a slow driving convoy on the 401, or make a Facebook page and rant endlessly on it, or....
Oh, wait...most of those things have been tried and didn't accomplish much, or worse yet, turned the very people whom really should be most in support of the cause (a lot of whom are getting raped on insurance) against the protesters because they were inconvenienced for a few minutes on their drive (ironically) to work or something.
So yes, what can WE do? Not much IMHO. This is an issue the government needs to tackle head-on by reducing what increasingly seems like the main cause of these high rates - fraud. Until there's a crackdown at both the government end to punish the people running these fraud schemes, and at the insurance company ends to find and root them out (which will cost them more $ than they likely stand to benefit from it, so that's likely why it doesn't happen) it will just continue to spiral upwards.