You got to vote and be active in politics and encourage as many people to do likewise. If more people did that the sum of our power would be far greater than the power of billionaires. We can then have reforms like regulating campaign contributions and lobbying and passing more regulations that protect the people.
For some countries there are things working against us. For example in the US billionaires have a lot of power and contribute heavily to politics in part due to the Supreme Court's decision in Citizens United v. FEC which opened the floodgates for unlimited political spending and has really harmed our country. My solution to this is to encourage people to boycott companies that donate heavily to Republicans and most importantly encourage people to vote for people who will help stop all the corruption.
Thank you so much for clarifying! Yes, now I understand it's a powerful thought like they can't stop me because I live in Sweden, I will keep protesting.
It reminds me of how many countries boycotted South Africa which helped end apartheid.